[Extensions] Update ExtensionService references in c/b/sync_file_system

Update references to ExtensionService in c/b/sync_file_system to use
extensions::ExtensionService.

There should be no behavior change as a result of this CL.

Bug: 117261
Change-Id: I43576ba459914801c64fac2e3834f079f8b62eb5
Reviewed-on: https://chromium-review.googlesource.com/1080008Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Commit-Queue: Devlin <rdevlin.cronin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#563105}

chrome/browser/sync_file_system/drive_backend/sync_engine.cc

@@ -209,7 +209,7 @@ std::unique_ptr<SyncEngine> SyncEngine::CreateForBrowserContext(
   Profile* profile = Profile::FromBrowserContext(context);
   drive::DriveNotificationManager* notification_manager =
       drive::DriveNotificationManagerFactory::GetForBrowserContext(context);
-  ExtensionService* extension_service =
+  extensions::ExtensionService* extension_service =
       extensions::ExtensionSystem::Get(context)->extension_service();
   SigninManagerBase* signin_manager =
       SigninManagerFactory::GetForProfile(profile);
@@ -336,7 +336,8 @@ void SyncEngine::InitializeInternal(
   worker_observer_.reset(new WorkerObserver(ui_task_runner_.get(),
                                             weak_ptr_factory_.GetWeakPtr()));
 
-  base::WeakPtr<ExtensionServiceInterface> extension_service_weak_ptr;
+  base::WeakPtr<extensions::ExtensionServiceInterface>
+      extension_service_weak_ptr;
   if (extension_service_)
     extension_service_weak_ptr = extension_service_->AsWeakPtr();
 
@@ -720,7 +721,7 @@ SyncEngine::SyncEngine(
     const base::FilePath& sync_file_system_dir,
     TaskLogger* task_logger,
     drive::DriveNotificationManager* notification_manager,
-    ExtensionServiceInterface* extension_service,
+    extensions::ExtensionServiceInterface* extension_service,
     SigninManagerBase* signin_manager,
     OAuth2TokenService* token_service,
     net::URLRequestContextGetter* request_context,

chrome/browser/sync_file_system/drive_backend/sync_worker.cc

@@ -45,7 +45,8 @@ void InvokeIdleCallback(const base::Closure& idle_callback,
 
 SyncWorker::SyncWorker(
     const base::FilePath& base_dir,
-    const base::WeakPtr<ExtensionServiceInterface>& extension_service,
+    const base::WeakPtr<extensions::ExtensionServiceInterface>&
+        extension_service,
     leveldb::Env* env_override)
     : base_dir_(base_dir),
       env_override_(env_override),
@@ -411,11 +412,13 @@ void SyncWorker::UpdateRegisteredApps() {
 }
 
 void SyncWorker::QueryAppStatusOnUIThread(
-    const base::WeakPtr<ExtensionServiceInterface>& extension_service_ptr,
+    const base::WeakPtr<extensions::ExtensionServiceInterface>&
+        extension_service_ptr,
     const std::vector<std::string>* app_ids,
     AppStatusMap* status,
     const base::Closure& callback) {
-  ExtensionServiceInterface* extension_service = extension_service_ptr.get();
+  extensions::ExtensionServiceInterface* extension_service =
+      extension_service_ptr.get();
   if (!extension_service) {
     callback.Run();
     return;