Remove isSupportedAttribute in svg

Source/core/svg/SVGFilterPrimitiveStandardAttributes.h

 /*
  * Copyright (C) 2004, 2005, 2006, 2007 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 39 matching lines @@
     SVGAnimatedLength* y() const { return m_y.get(); }
     SVGAnimatedLength* width() const { return m_width.get(); }
     SVGAnimatedLength* height() const { return m_height.get(); }
     SVGAnimatedString* result() const { return m_result.get(); }
 
     DECLARE_VIRTUAL_TRACE();
 
 protected:
     SVGFilterPrimitiveStandardAttributes(const QualifiedName&, Document&);
 
-    bool isSupportedAttribute(const QualifiedName&);
     virtual void svgAttributeChanged(const QualifiedName&) override;
     virtual void childrenChanged(const ChildrenChange&) override;
 
     void invalidate();
     void primitiveAttributeChanged(const QualifiedName&);
 
 private:
     virtual bool isFilterEffect() const override final { return true; }
 
     virtual LayoutObject* createLayoutObject(const ComputedStyle&) override;
     virtual bool layoutObjectIsNeeded(const ComputedStyle&) override final;
 
     RefPtrWillBeMember<SVGAnimatedLength> m_x;
     RefPtrWillBeMember<SVGAnimatedLength> m_y;
     RefPtrWillBeMember<SVGAnimatedLength> m_width;
     RefPtrWillBeMember<SVGAnimatedLength> m_height;
     RefPtrWillBeMember<SVGAnimatedString> m_result;
 };
 
 void invalidateFilterPrimitiveParent(SVGElement*);
 
 } // namespace blink
 
 #endif // SVGFilterPrimitiveStandardAttributes_h