[scheduling] Use ScopedTaskEnvironment instead of MessageLoop in drive

MessageLoop will go away, eventually.

BUG=891670

Change-Id: I95af02ea3f68b674dd66097c0b9b46538fbc4ad7
Reviewed-on: https://chromium-review.googlesource.com/c/1352778Reviewed-by: Stuart Langley <slangley@chromium.org>
Commit-Queue: Carlos Caballero <carlscab@google.com>
Cr-Commit-Position: refs/heads/master@{#613090}

components/drive/drive_uploader_unittest.cc

@@ -15,8 +15,8 @@
 
 #include "base/bind.h"
 #include "base/files/scoped_temp_dir.h"
-#include "base/message_loop/message_loop.h"
 #include "base/run_loop.h"
+#include "base/test/scoped_task_environment.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "base/values.h"
 #include "components/drive/service/dummy_drive_service.h"
@@ -420,7 +420,7 @@ class DriveUploaderTest : public testing::Test {
   void SetUp() override { ASSERT_TRUE(temp_dir_.CreateUniqueTempDir()); }
 
  protected:
-  base::MessageLoop message_loop_;
+  base::test::ScopedTaskEnvironment task_environment_;
   base::ScopedTempDir temp_dir_;
 };
 

components/drive/local_file_reader_unittest.cc

@@ -14,8 +14,8 @@
 #include "base/files/file_path.h"
 #include "base/files/scoped_temp_dir.h"
 #include "base/memory/ref_counted.h"
-#include "base/message_loop/message_loop.h"
 #include "base/rand_util.h"
+#include "base/test/scoped_task_environment.h"
 #include "base/threading/thread.h"
 #include "components/drive/chromeos/drive_test_util.h"
 #include "google_apis/drive/test_util.h"
@@ -56,7 +56,7 @@ class LocalFileReaderTest : public ::testing::Test {
         std::make_unique<LocalFileReader>(worker_thread_->task_runner().get());
   }
 
-  base::MessageLoop message_loop_;
+  base::test::ScopedTaskEnvironment task_environment_;
   base::ScopedTempDir temp_dir_;
   std::unique_ptr<base::Thread> worker_thread_;
   std::unique_ptr<LocalFileReader> file_reader_;

components/drive/service/fake_drive_service_unittest.cc

@@ -13,12 +13,12 @@
 #include "base/files/file_util.h"
 #include "base/files/scoped_temp_dir.h"
 #include "base/md5.h"
-#include "base/message_loop/message_loop.h"
 #include "base/run_loop.h"
 #include "base/stl_util.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/stringprintf.h"
 #include "base/strings/utf_string_conversions.h"
+#include "base/test/scoped_task_environment.h"
 #include "components/drive/file_system_core_util.h"
 #include "components/drive/service/test_util.h"
 #include "google_apis/drive/drive_api_parser.h"
@@ -226,7 +226,7 @@ class FakeDriveServiceTest : public testing::Test {
     return about_resource->largest_change_id();
   }
 
-  base::MessageLoop message_loop_;
+  base::test::ScopedTaskEnvironment task_environment_;
   FakeDriveService fake_service_;
 };