components: Move PrefRegistrySyncable into user_prefs namespace.

components/user_prefs/pref_registry_syncable.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 COMPONENTS_USER_PREFS_PREF_REGISTRY_SYNCABLE_H_
 #define COMPONENTS_USER_PREFS_PREF_REGISTRY_SYNCABLE_H_
 
 #include <set>
 #include <string>
 
 #include "base/prefs/pref_registry.h"
 #include "components/user_prefs/user_prefs_export.h"
 
 namespace base {
 class DictionaryValue;
 class FilePath;
 class ListValue;
 class Value;
 }
 
+namespace user_prefs {
+
 // A PrefRegistry that forces users to choose whether each registered
 // preference is syncable or not.
 //
 // Classes or components that want to register such preferences should
 // define a static function named RegisterUserPrefs that takes a
 // PrefRegistrySyncable*, and the top-level application using the
 // class or embedding the component should call this function at an
 // appropriate time before the PrefService for these preferences is
 // constructed. See e.g. chrome/browser/prefs/browser_prefs.cc which
 // does this for Chrome.
@@ skipping 86 matching lines @@
                                   PrefSyncStatus sync_status);
 
   SyncableRegistrationCallback callback_;
 
   // Contains the names of all registered preferences that are syncable.
   PrefToStatus syncable_preferences_;
 
   DISALLOW_COPY_AND_ASSIGN(PrefRegistrySyncable);
 };
 
+}  // namespace user_prefs
+
 #endif  // COMPONENTS_USER_PREFS_PREF_REGISTRY_SYNCABLE_H_