components: Move PrefRegistrySyncable into user_prefs namespace.

chrome/browser/media_galleries/media_galleries_preferences_factory.cc

 // 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.
 
 #include "chrome/browser/media_galleries/media_galleries_preferences_factory.h"
 
 #include "chrome/browser/media_galleries/media_galleries_preferences.h"
 #include "chrome/browser/profiles/incognito_helpers.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/profiles/profile_dependency_manager.h"
@@ skipping 17 matching lines @@
                                  ProfileDependencyManager::GetInstance()) {}
 
 MediaGalleriesPreferencesFactory::~MediaGalleriesPreferencesFactory() {}
 
 ProfileKeyedService* MediaGalleriesPreferencesFactory::BuildServiceInstanceFor(
     content::BrowserContext* profile) const {
   return new chrome::MediaGalleriesPreferences(static_cast<Profile*>(profile));
 }
 
 void MediaGalleriesPreferencesFactory::RegisterUserPrefs(
-    PrefRegistrySyncable* prefs) {
+    user_prefs::PrefRegistrySyncable* prefs) {
   chrome::MediaGalleriesPreferences::RegisterUserPrefs(prefs);
 }
 
 content::BrowserContext*
 MediaGalleriesPreferencesFactory::GetBrowserContextToUse(
     content::BrowserContext* context) const {
   return chrome::GetBrowserContextRedirectedInIncognito(context);
 }