Split PrefService into PrefService, PrefServiceSimple and PrefServiceSyncable.

chrome/browser/chromeos/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_CHROMEOS_PREFERENCES_H_
 #define CHROME_BROWSER_CHROMEOS_PREFERENCES_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 14 matching lines @@
 // the preferences. These include touchpad settings, etc.
 // When the preferences change, we change the settings to reflect the new value.
 class Preferences : public PrefServiceObserver {
  public:
   Preferences();
   explicit Preferences(
       input_method::InputMethodManager* input_method_manager);  // for testing
   virtual ~Preferences();
 
   // This method will register the prefs associated with Chrome OS settings.
-  static void RegisterUserPrefs(PrefService* prefs);
+  static void RegisterUserPrefs(PrefServiceSyncable* prefs);
 
   // This method will initialize Chrome OS settings to values in user prefs.
   void Init(PrefService* prefs);
 
   void InitUserPrefsForTesting(PrefService* prefs);
   void SetInputMethodListForTesting();
 
  private:
   // Initializes all member prefs.
   void InitUserPrefs(PrefService* prefs);
@@ skipping 110 matching lines @@
   BooleanPrefMember enable_screen_lock_;
 
   BooleanPrefMember enable_drm_;
 
   DISALLOW_COPY_AND_ASSIGN(Preferences);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_PREFERENCES_H_