Standardize usage of virtual/override/final specifiers.

chrome/browser/ui/views/validation_message_bubble_delegate.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_VIEWS_VALIDATION_MESSAGE_BUBBLE_DELEGATE_H_
 #define CHROME_BROWSER_UI_VIEWS_VALIDATION_MESSAGE_BUBBLE_DELEGATE_H_
 
 #include "ui/views/bubble/bubble_delegate.h"
 
 // A BubbleDelegateView implementation for form validation message bubble.
 // This class is exposed for testing.
 class ValidationMessageBubbleDelegate : public views::BubbleDelegateView {
  public:
   // An interface to observe the widget closing.
   class Observer {
    public:
     virtual void WindowClosing() = 0;
 
    protected:
     virtual ~Observer() {}
   };
 
   static const int kWindowMinWidth;
   static const int kWindowMaxWidth;
 
   ValidationMessageBubbleDelegate(const gfx::Rect& anchor_in_screen,
                                   const base::string16& main_text,
                                   const base::string16& sub_text,
                                   Observer* observer);
-  virtual ~ValidationMessageBubbleDelegate();
+  ~ValidationMessageBubbleDelegate() override;
 
   void Close();
   void SetPositionRelativeToAnchor(const gfx::Rect& anchor_in_screen);
 
   // BubbleDelegateView overrides:
-  virtual gfx::Size GetPreferredSize() const override;
-  virtual void DeleteDelegate() override;
-  virtual void WindowClosing() override;
+  gfx::Size GetPreferredSize() const override;
+  void DeleteDelegate() override;
+  void WindowClosing() override;
 
  private:
   Observer* observer_;
   int width_;
   int height_;
 
   DISALLOW_COPY_AND_ASSIGN(ValidationMessageBubbleDelegate);
 };
 
 #endif  // CHROME_BROWSER_UI_VIEWS_VALIDATION_MESSAGE_BUBBLE_DELEGATE_H_