Introduce PrefRegistrySyncable, simplifying PrefServiceSyncable.

chrome/browser/ui/gesture_prefs_observer_factory_aura.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_UI_GESTURE_PREFS_OBSERVER_FACTORY_AURA_H_
 #define CHROME_BROWSER_UI_GESTURE_PREFS_OBSERVER_FACTORY_AURA_H_
 
 #include "base/basictypes.h"
 #include "base/memory/singleton.h"
 #include "chrome/browser/profiles/profile_keyed_service_factory.h"
 
-class PrefServiceSyncable;
+class PrefRegistrySyncable;
+class PrefService;
 class Profile;
 
 // Create an observer per Profile that listens for gesture preferences updates.
 class GesturePrefsObserverFactoryAura : public ProfileKeyedServiceFactory {
  public:
   static GesturePrefsObserverFactoryAura* GetInstance();
 
  private:
   friend struct DefaultSingletonTraits<GesturePrefsObserverFactoryAura>;
 
   GesturePrefsObserverFactoryAura();
   virtual ~GesturePrefsObserverFactoryAura();
 
-  void RegisterOverscrollPrefs(PrefServiceSyncable* prefs);
-  void RegisterFlingCurveParameters(PrefServiceSyncable* prefs);
+  void RegisterOverscrollPrefs(PrefRegistrySyncable* prefs);
+  void RegisterFlingCurveParameters(PrefRegistrySyncable* prefs);
 
   // ProfileKeyedServiceFactory:
   virtual ProfileKeyedService* BuildServiceInstanceFor(
       Profile* profile) const OVERRIDE;
-  virtual void RegisterUserPrefs(PrefServiceSyncable* prefs) OVERRIDE;
+  virtual void DeprecatedRegisterUserPrefs(
+      PrefService* prefs,
+      PrefRegistrySyncable* registry) OVERRIDE;
   virtual bool ServiceIsCreatedWithProfile() const OVERRIDE;
   virtual bool ServiceRedirectedInIncognito() const OVERRIDE;
   virtual bool ServiceIsNULLWhileTesting() const OVERRIDE;
 
   DISALLOW_COPY_AND_ASSIGN(GesturePrefsObserverFactoryAura);
 };
 
 #endif  // CHROME_BROWSER_UI_GESTURE_PREFS_OBSERVER_FACTORY_AURA_H_