[SVG] SVGAnimatedString{,List} migration to new SVG property impl.

Source/core/svg/SVGMaskElement.h

 /*
  * Copyright (C) 2005 Alexander Kellett <lypanov@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,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 45 matching lines @@
     virtual bool selfHasRelativeLengths() const OVERRIDE;
 
     RefPtr<SVGAnimatedLength> m_x;
     RefPtr<SVGAnimatedLength> m_y;
     RefPtr<SVGAnimatedLength> m_width;
     RefPtr<SVGAnimatedLength> m_height;
     BEGIN_DECLARE_ANIMATED_PROPERTIES(SVGMaskElement)
         DECLARE_ANIMATED_ENUMERATION(MaskUnits, maskUnits, SVGUnitTypes::SVGUnitType)
         DECLARE_ANIMATED_ENUMERATION(MaskContentUnits, maskContentUnits, SVGUnitTypes::SVGUnitType)
     END_DECLARE_ANIMATED_PROPERTIES
-
-    // SVGTests
-    virtual void synchronizeRequiredFeatures() OVERRIDE { SVGTests::synchronizeRequiredFeatures(this); }
-    virtual void synchronizeRequiredExtensions() OVERRIDE { SVGTests::synchronizeRequiredExtensions(this); }
-    virtual void synchronizeSystemLanguage() OVERRIDE { SVGTests::synchronizeSystemLanguage(this); }
 };
 
 DEFINE_NODE_TYPE_CASTS(SVGMaskElement, hasTagName(SVGNames::maskTag));
 
 }
 
 #endif