Add OVERRIDE to chrome/browser/extensions/.

chrome/browser/extensions/extension_tab_helper.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_TAB_HELPER_H_
 #define CHROME_BROWSER_EXTENSIONS_EXTENSION_TAB_HELPER_H_
 #pragma once
 
 #include "base/memory/weak_ptr.h"
 #include "chrome/browser/extensions/app_notify_channel_setup.h"
@@ skipping 112 matching lines @@
 
   // WebstoreInlineInstaller::Delegate.
   virtual void OnInlineInstallSuccess(int install_id) OVERRIDE;
   virtual void OnInlineInstallFailure(int install_id,
                                       const std::string& error) OVERRIDE;
 
   // AppNotifyChannelSetup::Delegate.
   virtual void AppNotifyChannelSetupComplete(const std::string& channel_id,
                                              const std::string& error,
                                              int return_route_id,
-                                             int callback_id);
+                                             int callback_id) OVERRIDE;
 
   // Data for app extensions ---------------------------------------------------
 
   // If non-null this tab is an app tab and this is the extension the tab was
   // created for.
   const Extension* extension_app_;
 
   // Icon for extension_app_ (if non-null) or a manually-set icon for
   // non-extension apps.
   SkBitmap extension_app_icon_;
 
   // Process any extension messages coming from the tab.
   ExtensionFunctionDispatcher extension_function_dispatcher_;
 
   // Used for loading extension_app_icon_.
   scoped_ptr<ImageLoadingTracker> extension_app_image_loader_;
 
   // Cached web app info data.
   WebApplicationInfo web_app_info_;
 
   TabContentsWrapper* wrapper_;
 
   DISALLOW_COPY_AND_ASSIGN(ExtensionTabHelper);
 };
 
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_TAB_HELPER_H_