Fix virtual/override/final usage in Source/core/html/.

Source/core/html/HTMLImageElement.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2010 Google Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
@@ skipping 44 matching lines @@
 
 using namespace HTMLNames;
 
 class HTMLImageElement::ViewportChangeListener final : public MediaQueryListListener {
 public:
     static RefPtrWillBeRawPtr<ViewportChangeListener> create(HTMLImageElement* element)
     {
         return adoptRefWillBeNoop(new ViewportChangeListener(element));
     }
 
-    virtual void notifyMediaQueryChanged() override
+    void notifyMediaQueryChanged() override
     {
         if (m_element)
             m_element->notifyViewportChanged();
     }
 
 #if !ENABLE(OILPAN)
     void clearElement() { m_element = nullptr; }
 #endif
     DEFINE_INLINE_VIRTUAL_TRACE()
     {
@@ skipping 669 matching lines @@
     ensureUserAgentShadowRoot();
 }
 
 bool HTMLImageElement::isOpaque() const
 {
     Image* image = const_cast<HTMLImageElement*>(this)->imageContents();
     return image && image->currentFrameKnownToBeOpaque();
 }
 
 }