Standardize usage of virtual/override/final in components/

components/renderer_context_menu/context_menu_delegate.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 "components/renderer_context_menu/context_menu_delegate.h"
 
 #include "content/public/browser/web_contents.h"
 
 namespace {
 
 const char kMenuDelegateUserDataKey[] = "RendererContextMenuMenuDelegate";
 
 class ContextMenuDelegateUserData : public base::SupportsUserData::Data {
  public:
   explicit ContextMenuDelegateUserData(ContextMenuDelegate* menu_delegate)
       : menu_delegate_(menu_delegate) {}
-  virtual ~ContextMenuDelegateUserData() {}
+  ~ContextMenuDelegateUserData() override {}
   ContextMenuDelegate* menu_delegate() { return menu_delegate_; }
 
  private:
   ContextMenuDelegate* menu_delegate_;  // not owned by us.
 };
 
 }  // namespace
 
 ContextMenuDelegate::ContextMenuDelegate(content::WebContents* web_contents) {
   web_contents->SetUserData(&kMenuDelegateUserDataKey,
                             new ContextMenuDelegateUserData(this));
 }
 
 ContextMenuDelegate::~ContextMenuDelegate() {
 }
 
 // static
 ContextMenuDelegate* ContextMenuDelegate::FromWebContents(
     content::WebContents* web_contents) {
   ContextMenuDelegateUserData* user_data =
       static_cast<ContextMenuDelegateUserData*>(
           web_contents->GetUserData(&kMenuDelegateUserDataKey));
   return user_data ? user_data->menu_delegate() : NULL;
 }