Standardize usage of virtual/override/final in components/

components/dom_distiller/content/web_contents_main_frame_observer.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 COMPONENTS_DOM_DISTILLER_CONTENT_WEB_CONTENTS_MAIN_FRAME_OBSERVER_H_
 #define COMPONENTS_DOM_DISTILLER_CONTENT_WEB_CONTENTS_MAIN_FRAME_OBSERVER_H_
 
 #include "content/public/browser/web_contents.h"
 #include "content/public/browser/web_contents_observer.h"
 #include "content/public/browser/web_contents_user_data.h"
 
 namespace dom_distiller {
 
 // Tracks whether DocumentLoadedInFrame has been called for the main frame for
 // the current main frame for the given WebContents. It removes itself as an
 // observer if the WebContents is destroyed or the render process is gone.
 class WebContentsMainFrameObserver
     : public content::WebContentsObserver,
       public content::WebContentsUserData<WebContentsMainFrameObserver> {
  public:
-  virtual ~WebContentsMainFrameObserver();
+  ~WebContentsMainFrameObserver() override;
 
   bool is_document_loaded_in_main_frame() {
     return is_document_loaded_in_main_frame_;
   }
 
   bool is_initialized() { return is_initialized_; }
 
   // content::WebContentsObserver implementation.
-  virtual void DocumentLoadedInFrame(
+  void DocumentLoadedInFrame(
       content::RenderFrameHost* render_frame_host) override;
-  virtual void DidNavigateMainFrame(
+  void DidNavigateMainFrame(
       const content::LoadCommittedDetails& details,
       const content::FrameNavigateParams& params) override;
-  virtual void RenderProcessGone(base::TerminationStatus status) override;
+  void RenderProcessGone(base::TerminationStatus status) override;
 
  private:
   explicit WebContentsMainFrameObserver(content::WebContents* web_contents);
   friend class content::WebContentsUserData<WebContentsMainFrameObserver>;
 
   // Removes the observer and clears the WebContents member.
   void CleanUp();
 
   // Whether DocumentLoadedInFrame has been called for the tracked WebContents
   // for the current main frame. This is cleared when the main frame navigates,
   // and set again when DocumentLoadedInFrame is called for the main frame.
   bool is_document_loaded_in_main_frame_;
 
   // Whether this object has been correctly initialized. This is set as soon as
   // at least one call to DidNavigateMainFrame has happened.
   bool is_initialized_;
 
   DISALLOW_COPY_AND_ASSIGN(WebContentsMainFrameObserver);
 };
 
 }  // namespace dom_distiller
 
 #endif  // COMPONENTS_DOM_DISTILLER_CONTENT_WEB_CONTENTS_MAIN_FRAME_OBSERVER_H_