bookmarks: Move BookmarkNode into 'bookmarks' namespace.

chrome/browser/ui/cocoa/bookmarks/bookmark_bar_folder_button_cell.mm

 // Copyright (c) 2011 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.
 
 #import "chrome/browser/ui/cocoa/bookmarks/bookmark_bar_folder_button_cell.h"
 
+using bookmarks::BookmarkNode;
+
 @implementation BookmarkBarFolderButtonCell
 
 + (id)buttonCellForNode:(const BookmarkNode*)node
                    text:(NSString*)text
                   image:(NSImage*)image
          menuController:(BookmarkContextMenuCocoaController*)menuController {
   id buttonCell =
       [[[BookmarkBarFolderButtonCell alloc] initForNode:node
                                                    text:text
                                                   image:image
                                          menuController:menuController]
        autorelease];
   return buttonCell;
 }
 
 - (BOOL)isFolderButtonCell {
   return YES;
 }
 
 - (void)setMouseInside:(BOOL)flag animate:(BOOL)animated {
 }
 
 @end