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

Source/core/svg/SVGZoomEvent.h

 /*
  * Copyright (C) 2004, 2005 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2004, 2005 Rob Buis <buis@kde.org>
  * Copyright (C) 2006 Samuel Weinig <sam.weinig@gmail.com>
  *
  * 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 30 matching lines @@
     PassRefPtrWillBeRawPtr<SVGRectTearOff> zoomRectScreen() const;
 
     float previousScale() const;
 
     PassRefPtrWillBeRawPtr<SVGPointTearOff> previousTranslate() const;
 
     float newScale() const;
 
     PassRefPtrWillBeRawPtr<SVGPointTearOff> newTranslate() const;
 
-    virtual const AtomicString& interfaceName() const override;
+    const AtomicString& interfaceName() const override;
 
     DECLARE_VIRTUAL_TRACE();
 
 private:
     SVGZoomEvent();
 
     float m_newScale;
     float m_previousScale;
 
     FloatPoint m_newTranslate;
     FloatPoint m_previousTranslate;
 };
 
 } // namespace blink
 
 #endif // SVGZoomEvent_h