Add OVERRIDE to content/.

content/browser/accessibility/browser_accessibility_manager_mac.h

-// Copyright (c) 2010 The Chromium Authors. All rights reserved.
+// 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 CONTENT_BROWSER_ACCESSIBILITY_BROWSER_ACCESSIBILITY_MANAGER_MAC_H_
 #define CONTENT_BROWSER_ACCESSIBILITY_BROWSER_ACCESSIBILITY_MANAGER_MAC_H_
 #pragma once
 
 #import <Cocoa/Cocoa.h>
 
 #include "content/browser/accessibility/browser_accessibility_manager.h"
 
 class BrowserAccessibilityManagerMac : public BrowserAccessibilityManager {
  public:
   // Implementation of BrowserAccessibilityManager.
-  virtual void NotifyAccessibilityEvent(int type, BrowserAccessibility* node);
+  virtual void NotifyAccessibilityEvent(int type,
+                                        BrowserAccessibility* node) OVERRIDE;
 
  private:
   // This gives BrowserAccessibilityManager::Create access to the class
   // constructor.
   friend class BrowserAccessibilityManager;
 
   BrowserAccessibilityManagerMac(gfx::NativeView parent_view,
                                  const webkit_glue::WebAccessibility& src,
                                  BrowserAccessibilityDelegate* delegate,
                                  BrowserAccessibilityFactory* factory);
 
   DISALLOW_COPY_AND_ASSIGN(BrowserAccessibilityManagerMac);
 };
 
 #endif  // CONTENT_BROWSER_ACCESSIBILITY_BROWSER_ACCESSIBILITY_MANAGER_MAC_H_