[Mac] Restore the old bookmark menus now that the experiment is over.

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"
+
+@implementation BookmarkBarFolderButtonCell
+
++ (id)buttonCellForNode:(const BookmarkNode*)node
+            contextMenu:(NSMenu*)contextMenu
+               cellText:(NSString*)cellText
+              cellImage:(NSImage*)cellImage {
+  id buttonCell =
+      [[[BookmarkBarFolderButtonCell alloc] initForNode:node
+                                            contextMenu:contextMenu
+                                               cellText:cellText
+                                              cellImage:cellImage]
+       autorelease];
+  return buttonCell;
+}
+
+- (BOOL)isFolderButtonCell {
+  return YES;
+}
+
+- (void)setMouseInside:(BOOL)flag animate:(BOOL)animated {
+}
+
+@end