Remove unused SVGElement::isSupported

Source/core/svg/SVGElement.h

 /*
  * Copyright (C) 2004, 2005, 2006, 2008 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2004, 2005, 2006 Rob Buis <buis@kde.org>
  * Copyright (C) 2009 Apple Inc. 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
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
@@ skipping 180 matching lines @@
     // https://bugs.webkit.org/show_bug.cgi?id=77938
     virtual bool areAuthorShadowsAllowed() const OVERRIDE { return false; }
 
     RenderStyle* computedStyle(PseudoId = NOPSEUDO);
     virtual RenderStyle* virtualComputedStyle(PseudoId pseudoElementSpecifier = NOPSEUDO) { return computedStyle(pseudoElementSpecifier); }
     virtual void willRecalcStyle(StyleRecalcChange) OVERRIDE;
     virtual bool isKeyboardFocusable() const OVERRIDE;
 
     void buildPendingResourcesIfNeeded();
 
-    virtual bool isSupported(StringImpl* feature, StringImpl* version) const;
-
     void mapInstanceToElement(SVGElementInstance*);
     void removeInstanceMapping(SVGElementInstance*);
 
     void cleanupAnimatedProperties();
     friend class CleanUpAnimatedPropertiesCaller;
 
     HashSet<SVGElement*> m_elementsWithRelativeLengths;
 
     BEGIN_DECLARE_ANIMATED_PROPERTIES(SVGElement)
         DECLARE_ANIMATED_STRING(ClassName, className)
@@ skipping 15 matching lines @@
         return DefaultHash<QualifiedName>::Hash::hash(key);
     }
     static bool equal(const QualifiedName& a, const QualifiedName& b) { return a.matches(b); }
 };
 
 DEFINE_NODE_TYPE_CASTS(SVGElement, isSVGElement());
 
 }
 
 #endif