Introduce PrefRegistrySyncable, simplifying PrefServiceSyncable.

chrome/browser/speech/chrome_speech_recognition_preferences.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_SPEECH_CHROME_SPEECH_RECOGNITION_PREFERENCES_H_
 #define CHROME_BROWSER_SPEECH_CHROME_SPEECH_RECOGNITION_PREFERENCES_H_
 
 #include "base/basictypes.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/singleton.h"
 #include "base/prefs/public/pref_change_registrar.h"
 #include "base/synchronization/lock.h"
 #include "base/threading/non_thread_safe.h"
 #include "chrome/browser/profiles/profile_keyed_service.h"
 #include "chrome/browser/profiles/profile_keyed_service_factory.h"
 #include "content/public/browser/speech_recognition_preferences.h"
 
+class PrefRegistrySyncable;
 class PrefService;
 
 namespace base {
 class ListValue;
 }
 
 // Utility class that handles persistent storage of speech recognition
 // preferences. Instances of this class must be obtained exclusively through the
 // method ChromeSpeechRecognitionPreferences::GetForProfile(...), so that
 // preferences are handled within the Profile (if not NULL). The internal
@@ skipping 34 matching lines @@
 
    private:
     friend struct DefaultSingletonTraits<Factory>;
 
     Factory();
     virtual ~Factory();
 
     // ProfileKeyedServiceFactory methods:
     virtual ProfileKeyedService* BuildServiceInstanceFor(Profile* profile)
         const OVERRIDE;
-    virtual void RegisterUserPrefs(PrefServiceSyncable* prefs) OVERRIDE;
+    virtual void RegisterUserPrefs(PrefRegistrySyncable* registry) OVERRIDE;
     virtual bool ServiceRedirectedInIncognito() const OVERRIDE;
     virtual bool ServiceIsNULLWhileTesting() const OVERRIDE;
     virtual bool ServiceIsCreatedWithProfile() const OVERRIDE;
 
     DISALLOW_COPY_AND_ASSIGN(Factory);
   };
 
   // This wrapper handles the binding between ChromeSpeechRecognitionPreferences
   // instances (which can have a longer lifetime, since they are refcounted) and
   // ProfileKeyedService (which lifetime depends on the Profile service). Upon
@@ skipping 29 matching lines @@
   scoped_ptr<base::ListValue> notifications_shown_;
 
   // Lock used to ensure exclusive access to preference variables that are
   // accessed by both threads (note: mutable is required to keep getters const).
   mutable base::Lock preferences_lock_;
 
   DISALLOW_COPY_AND_ASSIGN(ChromeSpeechRecognitionPreferences);
 };
 
 #endif  // CHROME_BROWSER_SPEECH_CHROME_SPEECH_RECOGNITION_PREFERENCES_H_