Migrate TaskFinishedCallback to OnceCallback.

Also updated DownloadServiceImpl's pending tasks and actions to use
OnceClosure and fixed lint errors in modified files.

Bug: 714018
Change-Id: I3efdae52913657519dfca2bd1aa7b46aa98ae45d
Reviewed-on: https://chromium-review.googlesource.com/1117311Reviewed-by: David Trainor <dtrainor@chromium.org>
Reviewed-by: Carlos Knippschild <carlosk@chromium.org>
Reviewed-by: Xing Liu <xingliu@chromium.org>
Commit-Queue: Sky Malice <skym@chromium.org>
Cr-Commit-Position: refs/heads/master@{#571573}

chrome/browser/android/download/service/download_background_task.cc

@@ -32,13 +32,13 @@ void JNI_DownloadBackgroundTask_StartBackgroundTask(
   DCHECK(profile);
 
   TaskFinishedCallback finish_callback =
-      base::Bind(&CallTaskFinishedCallback,
+      base::BindOnce(&CallTaskFinishedCallback,
                      base::android::ScopedJavaGlobalRef<jobject>(jcallback));
 
   DownloadService* download_service =
       DownloadServiceFactory::GetForBrowserContext(profile);
   download_service->OnStartScheduledTask(
-      static_cast<DownloadTaskType>(task_type), finish_callback);
+      static_cast<DownloadTaskType>(task_type), std::move(finish_callback));
 }
 
 // static

chrome/browser/android/download/service/download_task_scheduler.cc

@@ -18,8 +18,8 @@ void DownloadTaskScheduler::ScheduleTask(DownloadTaskType task_type,
                                          bool require_unmetered_network,
                                          bool require_charging,
                                          int optimal_battery_percentage,
-                                         long window_start_time_seconds,
-                                         long window_end_time_seconds) {
+                                         int64_t window_start_time_seconds,
+                                         int64_t window_end_time_seconds) {
   JNIEnv* env = base::android::AttachCurrentThread();
   Java_DownloadTaskScheduler_scheduleTask(
       env, static_cast<jint>(task_type), require_unmetered_network,

chrome/browser/android/download/service/download_task_scheduler.h

@@ -6,6 +6,7 @@
 #define CHROME_BROWSER_ANDROID_DOWNLOAD_SERVICE_DOWNLOAD_TASK_SCHEDULER_H_
 
 #include <jni.h>
+#include <stdint.h>
 #include <memory>
 
 #include "base/macros.h"
@@ -27,8 +28,8 @@ class DownloadTaskScheduler : public TaskScheduler {
                     bool require_unmetered_network,
                     bool require_charging,
                     int optimal_battery_percentage,
-                    long window_start_time_seconds,
-                    long window_end_time_seconds) override;
+                    int64_t window_start_time_seconds,
+                    int64_t window_end_time_seconds) override;
   void CancelTask(DownloadTaskType task_type) override;
 
  private:

chrome/browser/download/download_task_scheduler_impl.cc

@@ -26,8 +26,8 @@ void DownloadTaskSchedulerImpl::ScheduleTask(
     bool require_unmetered_network,
     bool require_charging,
     int optimal_battery_percentage,
-    long window_start_time_seconds,
-    long window_end_time_seconds) {
+    int64_t window_start_time_seconds,
+    int64_t window_end_time_seconds) {
   // We only rely on this for cleanup tasks. Since this doesn't restart Chrome,
   // for download tasks it doesn't do much and we handle them outside of task
   // scheduler.
@@ -52,7 +52,7 @@ void DownloadTaskSchedulerImpl::RunScheduledTask(
   download::DownloadService* download_service =
       DownloadServiceFactory::GetForBrowserContext(context_);
   download_service->OnStartScheduledTask(
-      task_type, base::Bind(&DownloadTaskSchedulerImpl::OnTaskFinished,
+      task_type, base::BindOnce(&DownloadTaskSchedulerImpl::OnTaskFinished,
                                 weak_factory_.GetWeakPtr()));
 }
 

chrome/browser/download/download_task_scheduler_impl.h

@@ -5,6 +5,7 @@
 #ifndef CHROME_BROWSER_DOWNLOAD_DOWNLOAD_TASK_SCHEDULER_IMPL_H_
 #define CHROME_BROWSER_DOWNLOAD_DOWNLOAD_TASK_SCHEDULER_IMPL_H_
 
+#include <stdint.h>
 #include <map>
 
 #include "base/cancelable_callback.h"
@@ -29,8 +30,8 @@ class DownloadTaskSchedulerImpl : public download::TaskScheduler {
                     bool require_unmetered_network,
                     bool require_charging,
                     int optimal_battery_percentage,
-                    long window_start_time_seconds,
-                    long window_end_time_seconds) override;
+                    int64_t window_start_time_seconds,
+                    int64_t window_end_time_seconds) override;
   void CancelTask(download::DownloadTaskType task_type) override;
 
  private:

components/download/internal/background_service/controller.h

@@ -102,7 +102,7 @@ class Controller {
 
   // See DownloadService::OnStartScheduledTask.
   virtual void OnStartScheduledTask(DownloadTaskType task_type,
-                                    const TaskFinishedCallback& callback) = 0;
+                                    TaskFinishedCallback callback) = 0;
 
   // See DownloadService::OnStopScheduledTask.
   virtual bool OnStopScheduledTask(DownloadTaskType task_type) = 0;

components/download/internal/background_service/controller_impl.cc

@@ -5,9 +5,8 @@
 #include "components/download/internal/background_service/controller_impl.h"
 
 #include <inttypes.h>
-
-#include <string>
-#include <vector>
+#include <algorithm>
+#include <utility>
 
 #include "base/bind.h"
 #include "base/callback_helpers.h"
@@ -304,10 +303,9 @@ DownloadClient ControllerImpl::GetOwnerOfDownload(const std::string& guid) {
   return entry ? entry->client : DownloadClient::INVALID;
 }
 
-void ControllerImpl::OnStartScheduledTask(
-    DownloadTaskType task_type,
-    const TaskFinishedCallback& callback) {
-  task_finished_callbacks_[task_type] = callback;
+void ControllerImpl::OnStartScheduledTask(DownloadTaskType task_type,
+                                          TaskFinishedCallback callback) {
+  task_finished_callbacks_[task_type] = std::move(callback);
 
   switch (controller_state_) {
     case State::READY:

components/download/internal/background_service/controller_impl.h

@@ -8,6 +8,8 @@
 #include <map>
 #include <memory>
 #include <set>
+#include <string>
+#include <vector>
 
 #include "base/cancelable_callback.h"
 #include "base/macros.h"
@@ -78,7 +80,7 @@ class ControllerImpl : public Controller,
                               const SchedulingParams& params) override;
   DownloadClient GetOwnerOfDownload(const std::string& guid) override;
   void OnStartScheduledTask(DownloadTaskType task_type,
-                            const TaskFinishedCallback& callback) override;
+                            TaskFinishedCallback callback) override;
   bool OnStopScheduledTask(DownloadTaskType task_type) override;
 
  private:

components/download/internal/background_service/controller_impl_unittest.cc

@@ -4,8 +4,10 @@
 
 #include "components/download/internal/background_service/controller_impl.h"
 
+#include <stdint.h>
 #include <algorithm>
 #include <memory>
+#include <utility>
 
 #include "base/bind.h"
 #include "base/guid.h"
@@ -104,7 +106,7 @@ class MockTaskScheduler : public TaskScheduler {
 
   // TaskScheduler implementation.
   MOCK_METHOD6(ScheduleTask,
-               void(DownloadTaskType, bool, bool, int, long, long));
+               void(DownloadTaskType, bool, bool, int, int64_t, int64_t));
   MOCK_METHOD1(CancelTask, void(DownloadTaskType));
 };
 
@@ -496,7 +498,7 @@ TEST_F(DownloadServiceControllerImplTest,
   store_->TriggerInit(true, std::make_unique<std::vector<Entry>>(entries));
   file_monitor_->TriggerInit(true);
   controller_->OnStartScheduledTask(DownloadTaskType::CLEANUP_TASK,
-                                    base::Bind(&NotifyTaskFinished));
+                                    base::BindOnce(&NotifyTaskFinished));
 
   task_runner_->RunUntilIdle();
   controller_->OnStopScheduledTask(DownloadTaskType::CLEANUP_TASK);
@@ -1025,7 +1027,7 @@ TEST_F(DownloadServiceControllerImplTest, OnDownloadSucceeded) {
   base::Time now = base::Time::Now();
   done_dentry.completion_time = now;
 
-  long start_time = 0;
+  int64_t start_time = 0;
   EXPECT_CALL(*task_scheduler_,
               ScheduleTask(DownloadTaskType::CLEANUP_TASK, _, _, _, _, _))
       .WillOnce(SaveArg<4>(&start_time));
@@ -1889,7 +1891,7 @@ TEST_F(DownloadServiceControllerImplTest, DownloadTaskQueuesAfterFinish) {
   // Simulate a task start, which should limit our calls to Reschedule() because
   // we are in a task.
   controller_->OnStartScheduledTask(DownloadTaskType::DOWNLOAD_TASK,
-                                    base::Bind(&NotifyTaskFinished));
+                                    base::BindOnce(&NotifyTaskFinished));
 
   // Set up new expectations to start a new download.
   ON_CALL(*scheduler_, Next(_, _))
@@ -1954,7 +1956,7 @@ TEST_F(DownloadServiceControllerImplTest, CleanupTaskQueuesAfterFinish) {
               ScheduleTask(DownloadTaskType::CLEANUP_TASK, _, _, _, _, _))
       .Times(0);
   controller_->OnStartScheduledTask(DownloadTaskType::CLEANUP_TASK,
-                                    base::Bind(&NotifyTaskFinished));
+                                    base::BindOnce(&NotifyTaskFinished));
 
   // Trigger download succeed events, which should not schedule a cleanup until
   // the existing cleanup has finished.

components/download/internal/background_service/download_service_impl.cc

@@ -4,6 +4,8 @@
 
 #include "components/download/internal/background_service/download_service_impl.h"
 
+#include <utility>
+
 #include "base/bind.h"
 #include "base/strings/string_util.h"
 #include "components/download/internal/background_service/controller.h"
@@ -31,17 +33,16 @@ const ServiceConfig& DownloadServiceImpl::GetConfig() {
   return service_config_;
 }
 
-void DownloadServiceImpl::OnStartScheduledTask(
-    DownloadTaskType task_type,
-    const TaskFinishedCallback& callback) {
+void DownloadServiceImpl::OnStartScheduledTask(DownloadTaskType task_type,
+                                               TaskFinishedCallback callback) {
   if (startup_completed_) {
-    controller_->OnStartScheduledTask(task_type, callback);
+    controller_->OnStartScheduledTask(task_type, std::move(callback));
     return;
   }
 
-  pending_tasks_[task_type] =
-      base::Bind(&Controller::OnStartScheduledTask,
-                 base::Unretained(controller_.get()), task_type, callback);
+  pending_tasks_[task_type] = base::BindOnce(
+      &Controller::OnStartScheduledTask, base::Unretained(controller_.get()),
+      task_type, base::Passed(&callback));
 }
 
 bool DownloadServiceImpl::OnStopScheduledTask(DownloadTaskType task_type) {
@@ -53,7 +54,7 @@ bool DownloadServiceImpl::OnStopScheduledTask(DownloadTaskType task_type) {
   if (iter != pending_tasks_.end()) {
     // We still need to run the callback in order to properly cleanup and notify
     // the system by running the respective task finished callbacks.
-    iter->second.Run();
+    std::move(iter->second).Run();
     pending_tasks_.erase(iter);
   }
 
@@ -81,9 +82,9 @@ void DownloadServiceImpl::StartDownload(const DownloadParams& download_params) {
   if (startup_completed_) {
     controller_->StartDownload(download_params);
   } else {
-    pending_actions_.push_back(base::Bind(&Controller::StartDownload,
-                                          base::Unretained(controller_.get()),
-                                          download_params));
+    pending_actions_.push_back(
+        base::BindOnce(&Controller::StartDownload,
+                       base::Unretained(controller_.get()), download_params));
   }
 }
 
@@ -93,7 +94,7 @@ void DownloadServiceImpl::PauseDownload(const std::string& guid) {
   if (startup_completed_) {
     controller_->PauseDownload(guid);
   } else {
-    pending_actions_.push_back(base::Bind(
+    pending_actions_.push_back(base::BindOnce(
         &Controller::PauseDownload, base::Unretained(controller_.get()), guid));
   }
 }
@@ -104,9 +105,9 @@ void DownloadServiceImpl::ResumeDownload(const std::string& guid) {
   if (startup_completed_) {
     controller_->ResumeDownload(guid);
   } else {
-    pending_actions_.push_back(base::Bind(&Controller::ResumeDownload,
-                                          base::Unretained(controller_.get()),
-                                          guid));
+    pending_actions_.push_back(
+        base::BindOnce(&Controller::ResumeDownload,
+                       base::Unretained(controller_.get()), guid));
   }
 }
 
@@ -116,9 +117,9 @@ void DownloadServiceImpl::CancelDownload(const std::string& guid) {
   if (startup_completed_) {
     controller_->CancelDownload(guid);
   } else {
-    pending_actions_.push_back(base::Bind(&Controller::CancelDownload,
-                                          base::Unretained(controller_.get()),
-                                          guid));
+    pending_actions_.push_back(
+        base::BindOnce(&Controller::CancelDownload,
+                       base::Unretained(controller_.get()), guid));
   }
 }
 
@@ -130,9 +131,9 @@ void DownloadServiceImpl::ChangeDownloadCriteria(
   if (startup_completed_) {
     controller_->ChangeDownloadCriteria(guid, params);
   } else {
-    pending_actions_.push_back(base::Bind(&Controller::ChangeDownloadCriteria,
-                                          base::Unretained(controller_.get()),
-                                          guid, params));
+    pending_actions_.push_back(
+        base::BindOnce(&Controller::ChangeDownloadCriteria,
+                       base::Unretained(controller_.get()), guid, params));
   }
 }
 
@@ -142,14 +143,14 @@ Logger* DownloadServiceImpl::GetLogger() {
 
 void DownloadServiceImpl::OnControllerInitialized() {
   while (!pending_actions_.empty()) {
-    auto callback = pending_actions_.front();
-    callback.Run();
+    auto callback = std::move(pending_actions_.front());
     pending_actions_.pop_front();
+    std::move(callback).Run();
   }
 
   while (!pending_tasks_.empty()) {
     auto iter = pending_tasks_.begin();
-    iter->second.Run();
+    std::move(iter->second).Run();
     pending_tasks_.erase(iter);
   }
 

components/download/internal/background_service/download_service_impl.h

@@ -34,7 +34,7 @@ class DownloadServiceImpl : public DownloadService {
   // DownloadService implementation.
   const ServiceConfig& GetConfig() override;
   void OnStartScheduledTask(DownloadTaskType task_type,
-                            const TaskFinishedCallback& callback) override;
+                            TaskFinishedCallback callback) override;
   bool OnStopScheduledTask(DownloadTaskType task_type) override;
   ServiceStatus GetStatus() override;
   void StartDownload(const DownloadParams& download_params) override;
@@ -56,8 +56,8 @@ class DownloadServiceImpl : public DownloadService {
   std::unique_ptr<Controller> controller_;
   ServiceConfigImpl service_config_;
 
-  base::circular_deque<base::Closure> pending_actions_;
-  std::map<DownloadTaskType, base::Closure> pending_tasks_;
+  base::circular_deque<base::OnceClosure> pending_actions_;
+  std::map<DownloadTaskType, base::OnceClosure> pending_tasks_;
   bool startup_completed_;
 
   DISALLOW_COPY_AND_ASSIGN(DownloadServiceImpl);

components/download/internal/background_service/empty_task_scheduler.cc

@@ -14,8 +14,8 @@ void EmptyTaskScheduler::ScheduleTask(DownloadTaskType task_type,
                                       bool require_unmetered_network,
                                       bool require_charging,
                                       int optimal_battery_percentage,
-                                      long window_start_time_seconds,
-                                      long window_end_time_seconds) {}
+                                      int64_t window_start_time_seconds,
+                                      int64_t window_end_time_seconds) {}
 
 void EmptyTaskScheduler::CancelTask(DownloadTaskType task_type) {}
 

components/download/internal/background_service/empty_task_scheduler.h

@@ -5,9 +5,10 @@
 #ifndef COMPONENTS_DOWNLOAD_INTERNAL_BACKGROUND_SERVICE_EMPTY_TASK_SCHEDULER_H_
 #define COMPONENTS_DOWNLOAD_INTERNAL_BACKGROUND_SERVICE_EMPTY_TASK_SCHEDULER_H_
 
-#include "components/download/public/background_service/task_scheduler.h"
+#include <stdint.h>
 
 #include "base/macros.h"
+#include "components/download/public/background_service/task_scheduler.h"
 
 namespace download {
 
@@ -23,8 +24,8 @@ class EmptyTaskScheduler : public TaskScheduler {
                     bool require_unmetered_network,
                     bool require_charging,
                     int optimal_battery_percentage,
-                    long window_start_time_seconds,
-                    long window_end_time_seconds) override;
+                    int64_t window_start_time_seconds,
+                    int64_t window_end_time_seconds) override;
   void CancelTask(DownloadTaskType task_type) override;
 
   DISALLOW_COPY_AND_ASSIGN(EmptyTaskScheduler);

components/download/internal/background_service/scheduler/scheduler_impl_unittest.cc

@@ -4,6 +4,7 @@
 
 #include "components/download/internal/background_service/scheduler/scheduler_impl.h"
 
+#include <stdint.h>
 #include <memory>
 
 #include "base/strings/string_number_conversions.h"
@@ -26,7 +27,7 @@ class MockTaskScheduler : public TaskScheduler {
   ~MockTaskScheduler() override = default;
 
   MOCK_METHOD6(ScheduleTask,
-               void(DownloadTaskType, bool, bool, int, long, long));
+               void(DownloadTaskType, bool, bool, int, int64_t, int64_t));
   MOCK_METHOD1(CancelTask, void(DownloadTaskType));
 };
 

components/download/internal/background_service/test/mock_controller.h

@@ -5,6 +5,8 @@
 #ifndef COMPONENTS_DOWNLOAD_INTERNAL_BACKGROUND_SERVICE_TEST_MOCK_CONTROLLER_H_
 #define COMPONENTS_DOWNLOAD_INTERNAL_BACKGROUND_SERVICE_TEST_MOCK_CONTROLLER_H_
 
+#include <string>
+
 #include "base/macros.h"
 #include "components/download/internal/background_service/controller.h"
 #include "components/download/internal/background_service/startup_status.h"
@@ -30,7 +32,7 @@ class MockController : public Controller {
                void(const std::string&, const SchedulingParams&));
   MOCK_METHOD1(GetOwnerOfDownload, DownloadClient(const std::string&));
   MOCK_METHOD2(OnStartScheduledTask,
-               void(DownloadTaskType, const TaskFinishedCallback&));
+               void(DownloadTaskType, TaskFinishedCallback));
   MOCK_METHOD1(OnStopScheduledTask, bool(DownloadTaskType task_type));
 
   void TriggerInitCompleted();

components/download/public/background_service/download_service.h

@@ -25,7 +25,7 @@ class ServiceConfig;
 struct DownloadParams;
 struct SchedulingParams;
 
-using TaskFinishedCallback = base::Callback<void(bool)>;
+using TaskFinishedCallback = base::OnceCallback<void(bool)>;
 
 // A service responsible for helping facilitate the scheduling and downloading
 // of file content from the web.  See |DownloadParams| for more details on the
@@ -62,7 +62,7 @@ class DownloadService : public KeyedService {
   // or OnStopScheduledTask is invoked by the system. Do not call this method
   // directly.
   virtual void OnStartScheduledTask(DownloadTaskType task_type,
-                                    const TaskFinishedCallback& callback) = 0;
+                                    TaskFinishedCallback callback) = 0;
 
   // Callback method to run by the service if the system decides to stop the
   // task. Returns true if the task needs to be rescheduled. Any pending

components/download/public/background_service/task_scheduler.h

@@ -5,6 +5,8 @@
 #ifndef COMPONENTS_DOWNLOAD_PUBLIC_BACKGROUND_SERVICE_TASK_SCHEDULER_H_
 #define COMPONENTS_DOWNLOAD_PUBLIC_BACKGROUND_SERVICE_TASK_SCHEDULER_H_
 
+#include <stdint.h>
+
 #include "components/download/public/background_service/download_task_types.h"
 
 namespace download {
@@ -23,8 +25,8 @@ class TaskScheduler {
                             bool require_unmetered_network,
                             bool require_charging,
                             int optimal_battery_percentage,
-                            long window_start_time_seconds,
-                            long window_end_time_seconds) = 0;
+                            int64_t window_start_time_seconds,
+                            int64_t window_end_time_seconds) = 0;
 
   // Cancels a pre-scheduled task of type |task_type|.
   virtual void CancelTask(DownloadTaskType task_type) = 0;

components/download/public/background_service/test/mock_download_service.h

@@ -5,6 +5,8 @@
 #ifndef COMPONENTS_DOWNLOAD_PUBLIC_BACKGROUND_SERVICE_TEST_MOCK_DOWNLOAD_SERVICE_H_
 #define COMPONENTS_DOWNLOAD_PUBLIC_BACKGROUND_SERVICE_TEST_MOCK_DOWNLOAD_SERVICE_H_
 
+#include <string>
+
 #include "base/macros.h"
 #include "components/download/public/background_service/download_params.h"
 #include "components/download/public/background_service/download_service.h"
@@ -22,8 +24,7 @@ class MockDownloadService : public DownloadService {
   // DownloadService implementation.
   MOCK_METHOD0(GetConfig, const ServiceConfig&());
   MOCK_METHOD2(OnStartScheduledTask,
-               void(DownloadTaskType task_type,
-                    const TaskFinishedCallback& callback));
+               void(DownloadTaskType task_type, TaskFinishedCallback callback));
   MOCK_METHOD1(OnStopScheduledTask, bool(DownloadTaskType task_type));
   MOCK_METHOD0(GetStatus, ServiceStatus());
   MOCK_METHOD1(StartDownload, void(const DownloadParams& download_params));

components/download/public/background_service/test/test_download_service.cc

@@ -4,8 +4,6 @@
 
 #include "components/download/public/background_service/test/test_download_service.h"
 
-#include <memory>
-
 #include "base/bind.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "components/download/public/background_service/client.h"
@@ -55,9 +53,8 @@ const ServiceConfig& TestDownloadService::GetConfig() {
   return *service_config_;
 }
 
-void TestDownloadService::OnStartScheduledTask(
-    DownloadTaskType task_type,
-    const TaskFinishedCallback& callback) {}
+void TestDownloadService::OnStartScheduledTask(DownloadTaskType task_type,
+                                               TaskFinishedCallback callback) {}
 
 bool TestDownloadService::OnStopScheduledTask(DownloadTaskType task_type) {
   return true;

components/download/public/background_service/test/test_download_service.h

@@ -6,6 +6,8 @@
 #define COMPONENTS_DOWNLOAD_PUBLIC_BACKGROUND_SERVICE_TEST_TEST_DOWNLOAD_SERVICE_H_
 
 #include <list>
+#include <memory>
+#include <string>
 
 #include "base/optional.h"
 #include "components/download/public/background_service/client.h"
@@ -21,13 +23,13 @@ namespace test {
 // Implementation of DownloadService used for testing.
 class TestDownloadService : public DownloadService {
  public:
-  explicit TestDownloadService();
+  TestDownloadService();
   ~TestDownloadService() override;
 
   // DownloadService implementation.
   const ServiceConfig& GetConfig() override;
   void OnStartScheduledTask(DownloadTaskType task_type,
-                            const TaskFinishedCallback& callback) override;
+                            TaskFinishedCallback callback) override;
   bool OnStopScheduledTask(DownloadTaskType task_type) override;
   DownloadService::ServiceStatus GetStatus() override;
   void StartDownload(const DownloadParams& download_params) override;

components/offline_pages/core/prefetch/test_download_service.cc

@@ -78,7 +78,7 @@ void TestDownloadService::SetTestFileData(const std::string& data) {
 
 void TestDownloadService::OnStartScheduledTask(
     download::DownloadTaskType task_type,
-    const download::TaskFinishedCallback& callback) {
+    download::TaskFinishedCallback callback) {
   NOTIMPLEMENTED();
 }
 bool TestDownloadService::OnStopScheduledTask(

components/offline_pages/core/prefetch/test_download_service.h

@@ -6,6 +6,7 @@
 #define COMPONENTS_OFFLINE_PAGES_CORE_PREFETCH_TEST_DOWNLOAD_SERVICE_H_
 
 #include <list>
+#include <string>
 
 #include "base/files/scoped_temp_dir.h"
 #include "base/optional.h"
@@ -19,14 +20,13 @@ namespace offline_pages {
 // Implementation of DownloadService used for testing.
 class TestDownloadService : public download::DownloadService {
  public:
-  explicit TestDownloadService();
+  TestDownloadService();
   ~TestDownloadService() override;
 
   // DownloadService implementation.
   const download::ServiceConfig& GetConfig() override;
-  void OnStartScheduledTask(
-      download::DownloadTaskType task_type,
-      const download::TaskFinishedCallback& callback) override;
+  void OnStartScheduledTask(download::DownloadTaskType task_type,
+                            download::TaskFinishedCallback callback) override;
   bool OnStopScheduledTask(download::DownloadTaskType task_type) override;
   DownloadService::ServiceStatus GetStatus() override;
   void StartDownload(const download::DownloadParams& download_params) override;