Add OVERRIDE to chrome/browser/.

chrome/browser/tab_contents/render_view_context_menu_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_TAB_CONTENTS_RENDER_VIEW_CONTEXT_MENU_MAC_H_
 #define CHROME_BROWSER_TAB_CONTENTS_RENDER_VIEW_CONTEXT_MENU_MAC_H_
 #pragma once
 
 #import <Cocoa/Cocoa.h>
 
 #include "base/memory/scoped_nsobject.h"
 #include "chrome/browser/tab_contents/render_view_context_menu.h"
 
 @class MenuController;
 
 // Mac implementation of the context menu display code. Uses a Cocoa NSMenu
 // to display the context menu. Internally uses an obj-c object as the
 // target of the NSMenu, bridging back to this C++ class.
 
 class RenderViewContextMenuMac : public RenderViewContextMenu {
  public:
   RenderViewContextMenuMac(TabContents* web_contents,
                            const ContextMenuParams& params,
                            NSView* parent_view);
   virtual ~RenderViewContextMenuMac();
-  virtual void ExecuteCommand(int id);
+  virtual void ExecuteCommand(int id) OVERRIDE;
 
   // RenderViewContextMenuDelegate implementation.
   virtual void UpdateMenuItem(int command_id,
                               bool enabled,
                               bool hidden,
                               const string16& title) OVERRIDE;
 
  protected:
-  // RenderViewContextMenu implementation-
-  virtual void PlatformInit();
+  // RenderViewContextMenu implementation.
+  virtual void PlatformInit() OVERRIDE;
   virtual bool GetAcceleratorForCommandId(
       int command_id,
-      ui::Accelerator* accelerator);
+      ui::Accelerator* accelerator) OVERRIDE;
 
-  virtual void LookUpInDictionary();
+  virtual void LookUpInDictionary() OVERRIDE;
 
   void InitPlatformMenu();
  private:
   scoped_nsobject<MenuController> menuController_;
   NSView* parent_view_;  // parent view
 };
 
 #endif  // CHROME_BROWSER_TAB_CONTENTS_RENDER_VIEW_CONTEXT_MENU_MAC_H_