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

chrome/browser/chromeos/arc/arc_auth_service_unittest.cc

 // Copyright 2016 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 <string>
 #include <vector>
 
 #include "base/bind.h"
 #include "base/files/file_path.h"
 #include "base/files/file_util.h"
 #include "base/files/scoped_temp_dir.h"
 #include "base/macros.h"
+#include "base/prefs/pref_service.h"
 #include "base/run_loop.h"
 #include "chrome/browser/chromeos/arc/arc_auth_service.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/common/pref_names.h"
 #include "chrome/test/base/testing_profile.h"
 #include "components/arc/arc_bridge_service.h"
 #include "components/arc/auth/arc_auth_fetcher.h"
 #include "components/arc/test/fake_arc_bridge_service.h"
-#include "components/prefs/pref_service.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/test/test_browser_thread_bundle.h"
 #include "google_apis/gaia/gaia_constants.h"
 #include "google_apis/gaia/gaia_urls.h"
 #include "net/http/http_status_code.h"
 #include "net/url_request/test_url_fetcher_factory.h"
 #include "net/url_request/url_fetcher.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace arc {
@@ skipping 158 matching lines @@
   content::BrowserThread::GetBlockingPool()->FlushForTesting();
   base::RunLoop().RunUntilIdle();
 
   ASSERT_EQ(ArcAuthService::State::NO_CODE, auth_service()->state());
 
   // Correctly stop service.
   auth_service()->Shutdown();
 }
 
 }  // namespace arc