Introduce PrefRegistrySyncable, simplifying PrefServiceSyncable.

chrome/browser/profiles/gaia_info_update_service.h

 // 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.
 
 #ifndef CHROME_BROWSER_PROFILES_GAIA_INFO_UPDATE_SERVICE_H_
 #define CHROME_BROWSER_PROFILES_GAIA_INFO_UPDATE_SERVICE_H_
 
 #include "base/compiler_specific.h"
 #include "base/gtest_prod_util.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/prefs/public/pref_member.h"
 #include "base/timer.h"
 #include "chrome/browser/profiles/profile_downloader.h"
 #include "chrome/browser/profiles/profile_downloader_delegate.h"
 #include "chrome/browser/profiles/profile_keyed_service.h"
 
-class PrefServiceSyncable;
 class Profile;
 class ProfileDownloader;
 
 // This service kicks off a download of the user's name and profile picture.
 // The results are saved in the profile info cache.
 class GAIAInfoUpdateService : public ProfileDownloaderDelegate,
                               public ProfileKeyedService {
  public:
   explicit GAIAInfoUpdateService(Profile* profile);
   virtual ~GAIAInfoUpdateService();
@@ skipping 23 matching lines @@
   Profile* profile_;
   scoped_ptr<ProfileDownloader> profile_image_downloader_;
   StringPrefMember username_pref_;
   base::Time last_updated_;
   base::OneShotTimer<GAIAInfoUpdateService> timer_;
 
   DISALLOW_COPY_AND_ASSIGN(GAIAInfoUpdateService);
 };
 
 #endif  // CHROME_BROWSER_PROFILES_GAIA_INFO_UPDATE_SERVICE_H_