Standardize usage of virtual/override/final in components/

components/dom_distiller/webui/dom_distiller_ui.h

 // Copyright 2013 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 COMPONENTS_DOM_DISTILLER_WEBUI_DOM_DISTILLER_UI_H_
 #define COMPONENTS_DOM_DISTILLER_WEBUI_DOM_DISTILLER_UI_H_
 
 #include <string>
 
 #include "content/public/browser/web_ui_controller.h"
 
 namespace dom_distiller {
 
 class DomDistillerService;
 
 // The WebUI controller for chrome://dom-distiller.
 class DomDistillerUi : public content::WebUIController {
  public:
   DomDistillerUi(content::WebUI* web_ui,
                  DomDistillerService* service,
                  const std::string& scheme);
-  virtual ~DomDistillerUi();
+  ~DomDistillerUi() override;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(DomDistillerUi);
 };
 
 }  // namespace dom_distiller
 
 #endif  // COMPONENTS_DOM_DISTILLER_WEBUI_DOM_DISTILLER_UI_H_