Move ScopedGroupBookmarkActions into bookmarks namespace.

components/bookmarks/browser/scoped_group_bookmark_actions.h

 // Copyright 2014 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_BOOKMARKS_BROWSER_SCOPED_GROUP_BOOKMARK_ACTIONS_H_
 #define COMPONENTS_BOOKMARKS_BROWSER_SCOPED_GROUP_BOOKMARK_ACTIONS_H_
 
 #include "base/macros.h"
 
 class BookmarkModel;
 
+namespace bookmarks {
+
 // Scopes the grouping of a set of changes into one undoable action.
 class ScopedGroupBookmarkActions {
  public:
   explicit ScopedGroupBookmarkActions(BookmarkModel* model);
   ~ScopedGroupBookmarkActions();
 
  private:
   BookmarkModel* model_;
 
   DISALLOW_COPY_AND_ASSIGN(ScopedGroupBookmarkActions);
 };
 
+}  // namespace bookmarks
+
 #endif  // COMPONENTS_BOOKMARKS_BROWSER_SCOPED_GROUP_BOOKMARK_ACTIONS_H_