Standardize usage of virtual/override/final in extensions/

extensions/browser/extension_function_dispatcher.cc

 // Copyright 2014 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.
 
 #include "extensions/browser/extension_function_dispatcher.h"
 
 #include "base/bind.h"
 #include "base/json/json_string_value_serializer.h"
 #include "base/lazy_instance.h"
 #include "base/logging.h"
@@ skipping 134 matching lines @@
   UIThreadResponseCallbackWrapper(
       const base::WeakPtr<ExtensionFunctionDispatcher>& dispatcher,
       RenderViewHost* render_view_host)
       : content::WebContentsObserver(
             content::WebContents::FromRenderViewHost(render_view_host)),
         dispatcher_(dispatcher),
         render_view_host_(render_view_host),
         weak_ptr_factory_(this) {
   }
 
-  virtual ~UIThreadResponseCallbackWrapper() {
-  }
+  ~UIThreadResponseCallbackWrapper() override {}
 
   // content::WebContentsObserver overrides.
-  virtual void RenderViewDeleted(
-      RenderViewHost* render_view_host) override {
+  void RenderViewDeleted(RenderViewHost* render_view_host) override {
     DCHECK_CURRENTLY_ON(BrowserThread::UI);
     if (render_view_host != render_view_host_)
       return;
 
     if (dispatcher_.get()) {
       dispatcher_->ui_thread_response_callback_wrappers_
           .erase(render_view_host);
     }
 
     delete this;
@@ skipping 293 matching lines @@
 
 // static
 void ExtensionFunctionDispatcher::SendAccessDenied(
     const ExtensionFunction::ResponseCallback& callback) {
   base::ListValue empty_list;
   callback.Run(ExtensionFunction::FAILED, empty_list,
                "Access to extension API denied.");
 }
 
 }  // namespace extensions