Revert of Delete base/prefs and update callers to use components.

components/drive/change_list_loader_unittest.cc

 // Copyright 2013 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/drive/change_list_loader.h"
 
 #include <stdint.h>
 
 #include "base/callback_helpers.h"
 #include "base/files/scoped_temp_dir.h"
 #include "base/macros.h"
 #include "base/memory/scoped_ptr.h"
+#include "base/prefs/testing_pref_service.h"
 #include "base/run_loop.h"
 #include "base/single_thread_task_runner.h"
 #include "base/thread_task_runner_handle.h"
 #include "components/drive/change_list_loader_observer.h"
 #include "components/drive/drive_test_util.h"
 #include "components/drive/event_logger.h"
 #include "components/drive/file_cache.h"
 #include "components/drive/file_change.h"
 #include "components/drive/file_system_core_util.h"
 #include "components/drive/job_scheduler.h"
 #include "components/drive/resource_metadata.h"
 #include "components/drive/service/fake_drive_service.h"
 #include "components/drive/service/test_util.h"
-#include "components/prefs/testing_pref_service.h"
 #include "content/public/test/test_browser_thread_bundle.h"
 #include "google_apis/drive/drive_api_parser.h"
 #include "google_apis/drive/test_util.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace drive {
 namespace internal {
 
 class TestChangeListLoaderObserver : public ChangeListLoaderObserver {
  public:
@@ skipping 358 matching lines @@
 
   // Unlock the loader, this should resume the pending update.
   lock.reset();
   base::RunLoop().RunUntilIdle();
   EXPECT_TRUE(
       observer.changed_files().CountDirectory(util::GetDriveMyDriveRootPath()));
 }
 
 }  // namespace internal
 }  // namespace drive