Standardize usage of virtual/override/final in chrome/browser/

chrome/browser/guest_view/app_view/chrome_app_view_guest_delegate.h

 // 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.
 
 #ifndef CHROME_BROWSER_GUEST_VIEW_APP_VIEW_CHROME_APP_VIEW_GUEST_DELEGATE_H_
 #define CHROME_BROWSER_GUEST_VIEW_APP_VIEW_CHROME_APP_VIEW_GUEST_DELEGATE_H_
 
 #include "content/public/common/context_menu_params.h"
 #include "extensions/browser/guest_view/app_view/app_view_guest_delegate.h"
 
 namespace extensions {
 
 class ChromeAppViewGuestDelegate : public AppViewGuestDelegate {
  public:
   ChromeAppViewGuestDelegate();
-  virtual ~ChromeAppViewGuestDelegate();
+  ~ChromeAppViewGuestDelegate() override;
 
-  virtual bool HandleContextMenu(
-      content::WebContents* web_contents,
-      const content::ContextMenuParams& params) override;
+  bool HandleContextMenu(content::WebContents* web_contents,
+                         const content::ContextMenuParams& params) override;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(ChromeAppViewGuestDelegate);
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_GUEST_VIEW_APP_VIEW_CHROME_APP_VIEW_GUEST_DELEGATE_H_