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

Source/core/html/HTMLSourceElement.cpp

 /*
  * Copyright (C) 2007, 2008, 2010 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 32 matching lines @@
 
 static SourceEventSender& sourceErrorEventSender()
 {
     DEFINE_STATIC_LOCAL(SourceEventSender, sharedErrorEventSender, (EventTypeNames::error));
     return sharedErrorEventSender;
 }
 
 class HTMLSourceElement::Listener final : public MediaQueryListListener {
 public:
     explicit Listener(HTMLSourceElement* element) : m_element(element) { }
-    virtual void notifyMediaQueryChanged() override
+    void notifyMediaQueryChanged() override
     {
         if (m_element)
             m_element->notifyMediaQueryChanged();
     }
 
     void clearElement() { m_element = nullptr; }
     DEFINE_INLINE_VIRTUAL_TRACE()
     {
         visitor->trace(m_element);
         MediaQueryListListener::trace(visitor);
@@ skipping 127 matching lines @@
 }
 
 DEFINE_TRACE(HTMLSourceElement)
 {
     visitor->trace(m_mediaQueryList);
     visitor->trace(m_listener);
     HTMLElement::trace(visitor);
 }
 
 }