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

Source/core/svg/SVGFEOffsetElement.h

 /*
  * Copyright (C) 2004, 2005, 2007 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2004, 2005 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 @@
 
     SVGAnimatedNumber* dx() { return m_dx.get(); }
     SVGAnimatedNumber* dy() { return m_dy.get(); }
     SVGAnimatedString* in1() { return m_in1.get(); }
 
     DECLARE_VIRTUAL_TRACE();
 
 private:
     explicit SVGFEOffsetElement(Document&);
 
-    virtual void svgAttributeChanged(const QualifiedName&) override;
-    virtual PassRefPtrWillBeRawPtr<FilterEffect> build(SVGFilterBuilder*, Filter*) override;
+    void svgAttributeChanged(const QualifiedName&) override;
+    PassRefPtrWillBeRawPtr<FilterEffect> build(SVGFilterBuilder*, Filter*) override;
 
     RefPtrWillBeMember<SVGAnimatedNumber> m_dx;
     RefPtrWillBeMember<SVGAnimatedNumber> m_dy;
     RefPtrWillBeMember<SVGAnimatedString> m_in1;
 };
 
 } // namespace blink
 
 #endif // SVGFEOffsetElement_h