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

Source/core/html/MediaDocument.cpp

 /*
  * Copyright (C) 2008 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 45 matching lines @@
         return adoptRefWillBeNoop(new MediaDocumentParser(document));
     }
 
 private:
     explicit MediaDocumentParser(Document* document)
         : RawDataDocumentParser(document)
         , m_didBuildDocumentStructure(false)
     {
     }
 
-    virtual void appendBytes(const char*, size_t) override;
+    void appendBytes(const char*, size_t) override;
 
     void createDocumentStructure();
 
     bool m_didBuildDocumentStructure;
 };
 
 void MediaDocumentParser::createDocumentStructure()
 {
     ASSERT(document());
     RefPtrWillBeRawPtr<HTMLHtmlElement> rootElement = HTMLHtmlElement::create(*document());
@@ skipping 70 matching lines @@
         KeyboardEvent* keyboardEvent = toKeyboardEvent(event);
         if (keyboardEvent->keyIdentifier() == "U+0020" || keyboardEvent->keyCode() == VKEY_MEDIA_PLAY_PAUSE) {
             // space or media key (play/pause)
             video->togglePlayState();
             event->setDefaultHandled();
         }
     }
 }
 
 }