Use ScopedTaskEnvironment instead of MessageLoop in components unit tests.

components/browser_sync/profile_sync_service_unittest.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "components/browser_sync/profile_sync_service.h"
 
 #include <utility>
 
 #include "base/callback.h"
 #include "base/command_line.h"
 #include "base/feature_list.h"
 #include "base/memory/ptr_util.h"
 #include "base/run_loop.h"
 #include "base/single_thread_task_runner.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/test/scoped_feature_list.h"
+#include "base/test/scoped_task_environment.h"
 #include "base/test/sequenced_worker_pool_owner.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "base/values.h"
 #include "components/browser_sync/browser_sync_switches.h"
 #include "components/browser_sync/profile_sync_test_util.h"
 #include "components/invalidation/impl/profile_invalidation_provider.h"
 #include "components/invalidation/public/invalidation_service.h"
 #include "components/signin/core/browser/account_tracker_service.h"
 #include "components/signin/core/browser/fake_signin_manager.h"
 #include "components/strings/grit/components_strings.h"
@@ skipping 315 matching lines @@
 
  protected:
   void PumpLoop() {
     base::RunLoop run_loop;
     base::ThreadTaskRunnerHandle::Get()->PostTask(FROM_HERE,
                                                   run_loop.QuitClosure());
     run_loop.Run();
   }
 
  private:
-  base::MessageLoop message_loop_;
+  base::test::ScopedTaskEnvironment scoped_task_environment_;
   ProfileSyncServiceBundle profile_sync_service_bundle_;
   std::unique_ptr<ProfileSyncService> service_;
 
   // The current component factory used by sync. May be null if the server
   // hasn't been created yet.
   syncer::SyncApiComponentFactoryMock* component_factory_;
 };
 
 // Verify that the server URLs are sane.
 TEST_F(ProfileSyncServiceTest, InitialState) {
@@ skipping 599 matching lines @@
   // Progress the controller to RUNNING first, which is how the service
   // determines whether a type is enabled.
   controller->StartAssociating(base::Bind(&DoNothing));
   controller->FinishStart(DataTypeController::OK_FIRST_RUN);
   service()->RegisterDataTypeController(std::move(controller));
   EXPECT_NE(nullptr, service()->GetOpenTabsUIDelegate());
 }
 
 }  // namespace
 }  // namespace browser_sync