Move isValid implementations into SVGGraphicsElement

Source/core/svg/SVGDefsElement.cpp

 /*
  * Copyright (C) 2004, 2005 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 27 matching lines @@
 {
     ScriptWrappable::init(this);
     registerAnimatedPropertiesForSVGDefsElement();
 }
 
 PassRefPtr<SVGDefsElement> SVGDefsElement::create(Document& document)
 {
     return adoptRef(new SVGDefsElement(document));
 }
 
-bool SVGDefsElement::isValid() const
-{
-    return SVGTests::isValid();
-}
-
 RenderObject* SVGDefsElement::createRenderer(RenderStyle*)
 {
     return new RenderSVGHiddenContainer(this);
 }
 
 }