Remove content::NotificationObserver dependency from most Prefs code.

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_observer.h"
 #include "base/timer.h"
 #include "chrome/browser/api/prefs/pref_member.h"
 #include "chrome/browser/profiles/profile_downloader.h"
 #include "chrome/browser/profiles/profile_downloader_delegate.h"
-#include "content/public/browser/notification_observer.h"
 
 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 content::NotificationObserver {
+                              public PrefObserver {
  public:
   explicit GAIAInfoUpdateService(Profile* profile);
   virtual ~GAIAInfoUpdateService();
 
   // Updates the GAIA info for the profile associated with this instance.
   virtual void Update();
 
   // Checks if downloading GAIA info for the given profile is allowed.
   static bool ShouldUseGAIAProfileInfo(Profile* profile);
 
   // Register prefs for a profile.
   static void RegisterUserPrefs(PrefServiceBase* prefs);
 
   // ProfileDownloaderDelegate:
   virtual bool NeedsProfilePicture() const OVERRIDE;
   virtual int GetDesiredImageSideLength() const OVERRIDE;
   virtual Profile* GetBrowserProfile() OVERRIDE;
   virtual std::string GetCachedPictureURL() const OVERRIDE;
   virtual void OnProfileDownloadSuccess(ProfileDownloader* downloader) OVERRIDE;
   virtual void OnProfileDownloadFailure(ProfileDownloader* downloader) OVERRIDE;
 
  private:
   FRIEND_TEST_ALL_PREFIXES(GAIAInfoUpdateServiceTest, ScheduleUpdate);
 
-  // content::NotificationObserver:
-  virtual void Observe(int type,
-                       const content::NotificationSource& source,
-                       const content::NotificationDetails& details) OVERRIDE;
+  // PrefObserver:
+  virtual void OnPreferenceChanged(PrefServiceBase* service,
+                                   const std::string& pref_name) OVERRIDE;
 
 
   void OnUsernameChanged();
   void ScheduleNextUpdate();
 
   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_