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

Source/core/svg/SVGStopElement.h

 /*
  * Copyright (C) 2004, 2005, 2007, 2008 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2004, 2005, 2006 Rob Buis <buis@kde.org>
  *
  * 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.
  *
  * This library is distributed in the hope that it will be useful,
@@ skipping 24 matching lines @@
 
     Color stopColorIncludingOpacity() const;
 
     SVGAnimatedNumber* offset() { return m_offset.get(); }
 
     DECLARE_VIRTUAL_TRACE();
 
 private:
     explicit SVGStopElement(Document&);
 
-    virtual void svgAttributeChanged(const QualifiedName&) override;
+    void svgAttributeChanged(const QualifiedName&) override;
 
-    virtual LayoutObject* createLayoutObject(const ComputedStyle&) override;
-    virtual bool layoutObjectIsNeeded(const ComputedStyle&) override;
+    LayoutObject* createLayoutObject(const ComputedStyle&) override;
+    bool layoutObjectIsNeeded(const ComputedStyle&) override;
 
     RefPtrWillBeMember<SVGAnimatedNumber> m_offset;
 };
 
 } // namespace blink
 
 #endif // SVGStopElement_h