Add OVERRIDE to chrome/browser/extensions/.

chrome/browser/extensions/extensions_startup.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_EXTENSIONS_STARTUP_H_
 #define CHROME_BROWSER_EXTENSIONS_EXTENSIONS_STARTUP_H_
 #pragma once
 
 #include "base/memory/scoped_ptr.h"
 #include "chrome/browser/extensions/pack_extension_job.h"
 
 class CommandLine;
 class Profile;
 
 // Initialization helpers for various Extension startup actions.
 class ExtensionsStartupUtil : public PackExtensionJob::Client {
  public:
   ExtensionsStartupUtil();
   virtual ~ExtensionsStartupUtil();
 
   virtual void OnPackSuccess(const FilePath& crx_path,
-                             const FilePath& output_private_key_path);
-  virtual void OnPackFailure(const std::string& error_message);
+                             const FilePath& output_private_key_path) OVERRIDE;
+  virtual void OnPackFailure(const std::string& error_message) OVERRIDE;
 
   // Handle --pack-extension flag from the |cmd_line| by packing the specified
   // extension. Returns false if the pack job failed.
   bool PackExtension(const CommandLine& cmd_line);
 
   // Handle --uninstall-extension flag from the |cmd_line| by uninstalling the
   // specified extension from |profile|. Returns false if the uninstall job
   // could not be started.
   bool UninstallExtension(const CommandLine& cmd_line, Profile* profile);
 
  private:
   void ShowPackExtensionMessage(const std::wstring& caption,
                                 const std::wstring& message);
   scoped_refptr<PackExtensionJob> pack_job_;
   bool pack_job_succeeded_;
 
   DISALLOW_COPY_AND_ASSIGN(ExtensionsStartupUtil);
 };
 
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSIONS_STARTUP_H_