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

chrome/browser/ui/fullscreen/fullscreen_within_tab_helper.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_UI_FULLSCREEN_FULLSCREEN_WITHIN_TAB_HELPER_H_
 #define CHROME_BROWSER_UI_FULLSCREEN_FULLSCREEN_WITHIN_TAB_HELPER_H_
 
 #include "content/public/browser/web_contents_user_data.h"
 
 // Helper used by FullscreenController to track the state of a WebContents that
@@ skipping 18 matching lines @@
     is_fullscreen_for_captured_tab_ = is_fullscreen;
   }
 
   // Immediately remove and destroy the FullscreenWithinTabHelper instance
   // associated with |web_contents|.
   static void RemoveForWebContents(content::WebContents* web_contents);
 
  private:
   friend class content::WebContentsUserData<FullscreenWithinTabHelper>;
   explicit FullscreenWithinTabHelper(content::WebContents* ignored);
-  virtual ~FullscreenWithinTabHelper();
+  ~FullscreenWithinTabHelper() override;
 
   bool is_fullscreen_for_captured_tab_;
 
   DISALLOW_COPY_AND_ASSIGN(FullscreenWithinTabHelper);
 };
 
 #endif  // CHROME_BROWSER_UI_FULLSCREEN_FULLSCREEN_WITHIN_TAB_HELPER_H_