Add OVERRIDE to chrome/browser/ui/cocoa/.

chrome/browser/ui/cocoa/repost_form_warning_mac.h

 // 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.
 
 #ifndef CHROME_BROWSER_UI_COCOA_REPOST_FORM_WARNING_MAC_H_
 #define CHROME_BROWSER_UI_COCOA_REPOST_FORM_WARNING_MAC_H_
 #pragma once
 
 #import <Cocoa/Cocoa.h>
 
@@ skipping 11 matching lines @@
   // Convenience method that creates a new |RepostFormWarningController| and
   // then a new |RepostFormWarningMac| from that.
   static RepostFormWarningMac* Create(NSWindow* parent,
                                       TabContents* tab_contents);
 
   RepostFormWarningMac(NSWindow* parent,
                        RepostFormWarningController* controller,
                        TabContents* tab_contents);
 
   // ConstrainedWindowDelegateMacSystemSheet methods:
-  virtual void DeleteDelegate();
+  virtual void DeleteDelegate() OVERRIDE;
 
  private:
   virtual ~RepostFormWarningMac();
 
   scoped_ptr<RepostFormWarningController> controller_;
   TabContents* tab_contents_;
 
   DISALLOW_COPY_AND_ASSIGN(RepostFormWarningMac);
 };
 
 #endif  // CHROME_BROWSER_UI_COCOA_REPOST_FORM_WARNING_MAC_H_