Remove isSupportedAttribute in svg

Source/core/svg/SVGAnimationElement.h

 /*
  * Copyright (C) 2004, 2005 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2004, 2005, 2006 Rob Buis <buis@kde.org>
  * Copyright (C) 2007 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2008 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Cameron McCormack <cam@mcc.id.au>
  * Copyright (C) Research In Motion Limited 2011. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
@@ skipping 118 matching lines @@
         else
             animatedNumber = number;
     }
 
 protected:
     SVGAnimationElement(const QualifiedName&, Document&);
 
     void computeCSSPropertyValue(SVGElement*, CSSPropertyID, String& value);
     void determinePropertyValueTypes(const String& from, const String& to);
 
-    bool isSupportedAttribute(const QualifiedName&);
     virtual void parseAttribute(const QualifiedName&, const AtomicString&) override;
     virtual void svgAttributeChanged(const QualifiedName&) override;
 
     enum AttributeType {
         AttributeTypeCSS,
         AttributeTypeXML,
         AttributeTypeAuto
     };
     AttributeType attributeType() const { return m_attributeType; }
 
@@ skipping 56 matching lines @@
     String m_lastValuesAnimationFrom;
     String m_lastValuesAnimationTo;
     bool m_hasInvalidCSSAttributeType;
     CalcMode m_calcMode;
     AnimationMode m_animationMode;
 };
 
 } // namespace blink
 
 #endif // SVGAnimationElement_h