Add OVERRIDE to chrome/renderer.

chrome/renderer/extensions/chrome_v8_extension.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_RENDERER_EXTENSIONS_CHROME_V8_EXTENSION_H_
 #define CHROME_RENDERER_EXTENSIONS_CHROME_V8_EXTENSION_H_
 #pragma once
 
 #include "base/logging.h"
 #include "base/memory/linked_ptr.h"
@@ skipping 41 matching lines @@
   // that is unreachable by the page for the current context.
   static v8::Handle<v8::Value> GetChromeHidden(
       const v8::Handle<v8::Context>& context);
 
   void ContextWillBeReleased(ChromeV8Context* context);
 
   // Derived classes should call this at the end of their implementation in
   // order to expose common native functions, like GetChromeHidden, to the
   // v8 extension.
   virtual v8::Handle<v8::FunctionTemplate>
-      GetNativeFunction(v8::Handle<v8::String> name);
+      GetNativeFunction(v8::Handle<v8::String> name) OVERRIDE;
 
  protected:
   template<class T>
   static T* GetFromArguments(const v8::Arguments& args) {
     CHECK(!args.Data().IsEmpty());
     T* result = static_cast<T*>(args.Data().As<v8::External>()->Value());
     return result;
   }
 
   // Gets the render view for the current v8 context.
@@ skipping 33 matching lines @@
 
   // Map of all current handlers.
   typedef std::map<ChromeV8Context*,
                    linked_ptr<ChromeV8ExtensionHandler> > HandlerMap;
   HandlerMap handlers_;
 
   DISALLOW_COPY_AND_ASSIGN(ChromeV8Extension);
 };
 
 #endif  // CHROME_RENDERER_EXTENSIONS_CHROME_V8_EXTENSION_H_