Add OVERRIDE to chrome/browser/extensions/.

chrome/browser/extensions/extension_context_menu_api.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_EXTENSIONS_EXTENSION_CONTEXT_MENU_API_H__
 #define CHROME_BROWSER_EXTENSIONS_EXTENSION_CONTEXT_MENU_API_H__
 #pragma once
 
 #include "chrome/browser/extensions/extension_function.h"
 #include "chrome/browser/extensions/extension_menu_manager.h"
@@ skipping 46 matching lines @@
   // parentId key is not in properties, this will return true and leave |result|
   // unset. Also, it is considered an error if the item found has a type other
   // than NORMAL.
   bool GetParent(const base::DictionaryValue& properties,
                  const ExtensionMenuManager& manager,
                  ExtensionMenuItem** result);
 };
 
 class CreateContextMenuFunction : public ExtensionContextMenuFunction {
   virtual ~CreateContextMenuFunction() {}
-  virtual bool RunImpl();
+  virtual bool RunImpl() OVERRIDE;
   DECLARE_EXTENSION_FUNCTION_NAME("contextMenus.create")
 };
 
 class UpdateContextMenuFunction : public ExtensionContextMenuFunction {
   virtual ~UpdateContextMenuFunction() {}
-  virtual bool RunImpl();
+  virtual bool RunImpl() OVERRIDE;
   DECLARE_EXTENSION_FUNCTION_NAME("contextMenus.update")
 };
 
 class RemoveContextMenuFunction : public ExtensionContextMenuFunction {
   virtual ~RemoveContextMenuFunction() {}
-  virtual bool RunImpl();
+  virtual bool RunImpl() OVERRIDE;
   DECLARE_EXTENSION_FUNCTION_NAME("contextMenus.remove")
 };
 
 class RemoveAllContextMenusFunction : public ExtensionContextMenuFunction {
   virtual ~RemoveAllContextMenusFunction() {}
-  virtual bool RunImpl();
+  virtual bool RunImpl() OVERRIDE;
   DECLARE_EXTENSION_FUNCTION_NAME("contextMenus.removeAll")
 };
 
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_CONTEXT_MENU_API_H__