Remove isSupportedAttribute in svg

Source/core/svg/SVGFELightElement.h

 /*
  * Copyright (C) 2004, 2005 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2004, 2005, 2006 Rob Buis <buis@kde.org>
  * Copyright (C) 2005 Oliver Hunt <oliver@nerget.com>
  *
  * 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.
  *
@@ skipping 49 matching lines @@
     const SVGAnimatedNumber* specularExponent() const { return m_specularExponent.get(); }
     SVGAnimatedNumber* limitingConeAngle() { return m_limitingConeAngle.get(); }
     const SVGAnimatedNumber* limitingConeAngle() const { return m_limitingConeAngle.get(); }
 
     DECLARE_VIRTUAL_TRACE();
 
 protected:
     SVGFELightElement(const QualifiedName&, Document&);
 
 private:
-    bool isSupportedAttribute(const QualifiedName&);
     virtual void svgAttributeChanged(const QualifiedName&) override final;
     virtual void childrenChanged(const ChildrenChange&) override final;
 
     virtual bool layoutObjectIsNeeded(const ComputedStyle&) override { return false; }
 
     RefPtrWillBeMember<SVGAnimatedNumber> m_azimuth;
     RefPtrWillBeMember<SVGAnimatedNumber> m_elevation;
     RefPtrWillBeMember<SVGAnimatedNumber> m_x;
     RefPtrWillBeMember<SVGAnimatedNumber> m_y;
     RefPtrWillBeMember<SVGAnimatedNumber> m_z;
     RefPtrWillBeMember<SVGAnimatedNumber> m_pointsAtX;
     RefPtrWillBeMember<SVGAnimatedNumber> m_pointsAtY;
     RefPtrWillBeMember<SVGAnimatedNumber> m_pointsAtZ;
     RefPtrWillBeMember<SVGAnimatedNumber> m_specularExponent;
     RefPtrWillBeMember<SVGAnimatedNumber> m_limitingConeAngle;
 };
 
 inline bool isSVGFELightElement(const SVGElement& element)
 {
     return element.hasTagName(SVGNames::feDistantLightTag) || element.hasTagName(SVGNames::fePointLightTag) || element.hasTagName(SVGNames::feSpotLightTag);
 }
 
 DEFINE_SVGELEMENT_TYPE_CASTS_WITH_FUNCTION(SVGFELightElement);
 
 } // namespace blink
 
 #endif