Remove isSupportedAttribute in svg

Source/core/svg/SVGMarkerElement.h

 /*
  * Copyright (C) 2004, 2005, 2006, 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 61 matching lines @@
     SVGAnimatedAngle* orientAngle() { return m_orientAngle.get(); }
     SVGAnimatedEnumeration<SVGMarkerOrientType>* orientType() { return m_orientAngle->orientType(); }
 
     DECLARE_VIRTUAL_TRACE();
 
 private:
     explicit SVGMarkerElement(Document&);
 
     virtual bool needsPendingResourceHandling() const override { return false; }
 
-    bool isSupportedAttribute(const QualifiedName&);
     virtual void svgAttributeChanged(const QualifiedName&) override;
     virtual void childrenChanged(const ChildrenChange&) override;
 
     virtual LayoutObject* createLayoutObject(const ComputedStyle&) override;
     virtual bool layoutObjectIsNeeded(const ComputedStyle&) override { return true; }
 
     virtual bool selfHasRelativeLengths() const override;
 
     RefPtrWillBeMember<SVGAnimatedLength> m_refX;
     RefPtrWillBeMember<SVGAnimatedLength> m_refY;
     RefPtrWillBeMember<SVGAnimatedLength> m_markerWidth;
     RefPtrWillBeMember<SVGAnimatedLength> m_markerHeight;
     RefPtrWillBeMember<SVGAnimatedAngle> m_orientAngle;
     RefPtrWillBeMember<SVGAnimatedEnumeration<SVGMarkerUnitsType>> m_markerUnits;
 };
 
 } // namespace blink
 
 #endif // SVGMarkerElement_h