Introduce PrefRegistrySyncable, simplifying PrefServiceSyncable.

chrome/browser/google/google_url_tracker_factory.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_GOOGLE_GOOGLE_URL_TRACKER_FACTORY_H_
 #define CHROME_BROWSER_GOOGLE_GOOGLE_URL_TRACKER_FACTORY_H_
 
 #include "base/basictypes.h"
 #include "base/memory/singleton.h"
 #include "chrome/browser/profiles/profile_keyed_service_factory.h"
 
 class GoogleURLTracker;
-class PrefServiceSyncable;
+class PrefRegistrySyncable;
 class Profile;
 
 // Singleton that owns all GoogleURLTrackers and associates them with Profiles.
 class GoogleURLTrackerFactory : public ProfileKeyedServiceFactory {
  public:
   // Returns the GoogleURLTracker for |profile|.  This may return NULL for a
   // testing profile.
   static GoogleURLTracker* GetForProfile(Profile* profile);
 
   static GoogleURLTrackerFactory* GetInstance();
 
  private:
   friend struct DefaultSingletonTraits<GoogleURLTrackerFactory>;
 
   GoogleURLTrackerFactory();
   virtual ~GoogleURLTrackerFactory();
 
   // ProfileKeyedServiceFactory:
   virtual ProfileKeyedService* BuildServiceInstanceFor(
       Profile* profile) const OVERRIDE;
-  virtual void RegisterUserPrefs(PrefServiceSyncable* user_prefs) OVERRIDE;
+  virtual void RegisterUserPrefs(PrefRegistrySyncable* registry) OVERRIDE;
   virtual bool ServiceRedirectedInIncognito() const OVERRIDE;
   virtual bool ServiceIsCreatedWithProfile() const OVERRIDE;
   virtual bool ServiceIsNULLWhileTesting() const OVERRIDE;
 
   DISALLOW_COPY_AND_ASSIGN(GoogleURLTrackerFactory);
 };
 
 #endif  // CHROME_BROWSER_GOOGLE_GOOGLE_URL_TRACKER_FACTORY_H_