Remove some dead code in SVG "mixins"

third_party/WebKit/Source/core/svg/SVGZoomAndPan.cpp

 /*
  * Copyright (C) 2004, 2005, 2008 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2004, 2005, 2006, 2007 Rob Buis <buis@kde.org>
  * Copyright (C) 2014 Samsung Electronics. 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 23 matching lines @@
 void SVGZoomAndPan::resetZoomAndPan()
 {
     m_zoomAndPan = SVGZoomAndPanMagnify;
 }
 
 bool SVGZoomAndPan::isKnownAttribute(const QualifiedName& attrName)
 {
     return attrName == SVGNames::zoomAndPanAttr;
 }
 
-void SVGZoomAndPan::addSupportedAttributes(HashSet<QualifiedName>& supportedAttributes)
-{
-    supportedAttributes.add(SVGNames::zoomAndPanAttr);
-}
-
 static const LChar disable[] =  {'d', 'i', 's', 'a', 'b', 'l', 'e'};
 static const LChar magnify[] =  {'m', 'a', 'g', 'n', 'i', 'f', 'y'};
 
 template<typename CharType>
 static bool parseZoomAndPanInternal(const CharType*& start, const CharType* end, SVGZoomAndPanType& zoomAndPan)
 {
     if (skipString(start, end, disable, WTF_ARRAY_LENGTH(disable))) {
         zoomAndPan = SVGZoomAndPanDisable;
         return true;
     }
     if (skipString(start, end, magnify, WTF_ARRAY_LENGTH(magnify))) {
         zoomAndPan = SVGZoomAndPanMagnify;
         return true;
     }
     return false;
 }
 
 bool SVGZoomAndPan::parseZoomAndPan(const LChar*& start, const LChar* end)
 {
     return parseZoomAndPanInternal(start, end, m_zoomAndPan);
 }
 
 bool SVGZoomAndPan::parseZoomAndPan(const UChar*& start, const UChar* end)
 {
     return parseZoomAndPanInternal(start, end, m_zoomAndPan);
 }
 
 }