Remove unused SVG code

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 106 matching lines @@
     void setCursorImageValue(CSSCursorImageValue*);
     void cursorImageValueRemoved();
 
     SVGElement* correspondingElement();
     void setCorrespondingElement(SVGElement*);
 
     void synchronizeAnimatedSVGAttribute(const QualifiedName&) const;
 
     virtual PassRefPtr<RenderStyle> customStyleForRenderer() OVERRIDE FINAL;
 
-    static void synchronizeRequiredFeatures(SVGElement* contextElement);
-    static void synchronizeRequiredExtensions(SVGElement* contextElement);
-    static void synchronizeSystemLanguage(SVGElement* contextElement);
-
     virtual void synchronizeRequiredFeatures() { }
     virtual void synchronizeRequiredExtensions() { }
     virtual void synchronizeSystemLanguage() { }
 
 #ifndef NDEBUG
     virtual bool isAnimatableAttribute(const QualifiedName&) const;
 #endif
 
     MutableStylePropertySet* animatedSMILStyleProperties() const;
     MutableStylePropertySet* ensureAnimatedSMILStyleProperties();
@@ skipping 113 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