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

content/browser/accessibility/accessibility_ui.h

 // Copyright (c) 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 CHROME_BROWSER_UI_WEBUI_ACCESSIBILITY_UI_H_
 #define CHROME_BROWSER_UI_WEBUI_ACCESSIBILITY_UI_H_
 
 #include "content/public/browser/web_ui_controller.h"
 #include "content/public/browser/web_ui_data_source.h"
 
 namespace base {
   class ListValue;
 }  // namespace base
 
 namespace content {
 
 class AccessibilityUI : public WebUIController {
  public:
   explicit AccessibilityUI(WebUI* web_ui);
-  virtual ~AccessibilityUI();
+  ~AccessibilityUI() override;
 
  private:
   void ToggleAccessibility(const base::ListValue* args);
   void ToggleGlobalAccessibility(const base::ListValue* args);
   void RequestAccessibilityTree(const base::ListValue* args);
 
   DISALLOW_COPY_AND_ASSIGN(AccessibilityUI);
 };
 
 }  // namespace content
 
 #endif  // CHROME_BROWSER_UI_WEBUI_ACCESSIBILITY_UI_H_