Add OVERRIDE to chrome/browser/extensions/.

chrome/browser/extensions/extension_chrome_auth_private_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_CHROME_AUTH_PRIVATE_API_H_
 #define CHROME_BROWSER_EXTENSIONS_EXTENSION_CHROME_AUTH_PRIVATE_API_H_
 #pragma once
 
 #include <string>
 #include "chrome/browser/extensions/extension_function.h"
 
 class SetCloudPrintCredentialsFunction : public AsyncExtensionFunction {
  public:
   SetCloudPrintCredentialsFunction();
 
   // For use only in tests - sets a flag that can cause this function to not
   // actually set the credentials but instead simply reflect the passed in
   // arguments appended together as one string back in results_.
   static void SetTestMode(bool test_mode_enabled);
 
  protected:
   virtual ~SetCloudPrintCredentialsFunction();
 
-  virtual bool RunImpl();
+  virtual bool RunImpl() OVERRIDE;
 
  private:
   DECLARE_EXTENSION_FUNCTION_NAME("chromeAuthPrivate.setCloudPrintCredentials");
 };
 
 
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_CHROME_AUTH_PRIVATE_API_H_