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

Source/core/html/ImageDocument.cpp

 /*
  * Copyright (C) 2006, 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 78 matching lines @@
     {
         return toImageDocument(RawDataDocumentParser::document());
     }
 
 private:
     ImageDocumentParser(ImageDocument* document)
         : RawDataDocumentParser(document)
     {
     }
 
-    virtual void appendBytes(const char*, size_t) override;
+    void appendBytes(const char*, size_t) override;
     virtual void finish();
 };
 
 // --------
 
 static float pageZoomFactor(const Document* document)
 {
     LocalFrame* frame = document->frame();
     return frame ? frame->pageZoomFactor() : 1;
 }
@@ skipping 333 matching lines @@
 }
 
 bool ImageEventListener::operator==(const EventListener& listener)
 {
     if (const ImageEventListener* imageEventListener = ImageEventListener::cast(&listener))
         return m_doc == imageEventListener->m_doc;
     return false;
 }
 
 }