Use delegate protocols present in the 10.6 SDK

chrome/browser/cocoa/bookmark_bar_controller.mm

 // Copyright (c) 2009 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.
 
 #include "base/mac_util.h"
 #include "base/sys_string_conversions.h"
 #include "chrome/browser/bookmarks/bookmark_editor.h"
 #include "chrome/browser/bookmarks/bookmark_model.h"
 #include "chrome/browser/browser.h"
 #include "chrome/browser/browser_list.h"
@@ skipping 166 matching lines @@
     // Disabling the bar; hide if visible.
     if ([self isBookmarkBarVisible]) {
       [self showBookmarkBar:NO immediately:YES];
     }
     barIsEnabled_ = NO;
   }
 }
 
 // Return nil if menuItem has no delegate.
 - (BookmarkNode*)nodeFromMenuItem:(id)menuItem {
-  NSCell* cell = [[menuItem menu] delegate];
+  NSCell* cell = reinterpret_cast<NSCell*>([[menuItem menu] delegate]);
   if (!cell)
     return nil;
   BookmarkNode* node = static_cast<BookmarkNode*>(
       [[cell representedObject] pointerValue]);
   return node;
 }
 
 - (BookmarkNode*)nodeFromButton:(id)button {
   NSCell* cell = [button cell];
   BookmarkNode* node = static_cast<BookmarkNode*>(
@@ skipping 459 matching lines @@
 
 - (void)setUrlDelegate:(id<BookmarkURLOpener>)urlDelegate {
   urlDelegate_ = urlDelegate;
 }
 
 - (NSArray*)buttons {
   return buttons_.get();
 }
 
 @end