components: Move PrefRegistrySyncable into user_prefs namespace.

chrome/browser/ui/ash/chrome_launcher_prefs.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_ASH_CHROME_LAUNCHER_PREFS_H_
 #define CHROME_BROWSER_UI_ASH_CHROME_LAUNCHER_PREFS_H_
 
 #include <string>
 
-class PrefRegistrySyncable;
-
 namespace base {
 class DictionaryValue;
 }
 
+namespace user_prefs {
+class PrefRegistrySyncable;
+}
+
 namespace ash {
 
 // Path within the dictionary entries in the prefs::kPinnedLauncherApps list
 // specifying the extension ID of the app to be pinned by that entry.
 extern const char kPinnedAppsPrefAppIDPath[];
 
 // Values used for prefs::kShelfAutoHideBehavior.
 extern const char kShelfAutoHideBehaviorAlways[];
 extern const char kShelfAutoHideBehaviorNever[];
 
 // Values used for prefs::kShelfAlignment.
 extern const char kShelfAlignmentBottom[];
 extern const char kShelfAlignmentLeft[];
 extern const char kShelfAlignmentRight[];
 extern const char kShelfAlignmentTop[];
 
-void RegisterChromeLauncherUserPrefs(PrefRegistrySyncable* registry);
+void RegisterChromeLauncherUserPrefs(
+    user_prefs::PrefRegistrySyncable* registry);
 
 base::DictionaryValue* CreateAppDict(const std::string& app_id);
 
 }  // namespace ash
 
 #endif  // CHROME_BROWSER_UI_ASH_CHROME_LAUNCHER_PREFS_H_