Remove some dead code in SVG "mixins"

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

 /*
  * 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.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Library General Public License for more details.
  *
  * You should have received a copy of the GNU Library General Public License
  * along with this library; see the file COPYING.LIB.  If not, write to
  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  * Boston, MA 02110-1301, USA.
  */
 
 #ifndef SVGZoomAndPan_h
 #define SVGZoomAndPan_h
 
 #include "core/SVGNames.h"
 #include "core/dom/QualifiedName.h"
-#include "wtf/HashSet.h"
 
 namespace blink {
 
 class ExceptionState;
 
 enum SVGZoomAndPanType {
     SVGZoomAndPanUnknown = 0,
     SVGZoomAndPanDisable,
     SVGZoomAndPanMagnify
 };
 
 class SVGZoomAndPan {
 public:
     // Forward declare enumerations in the W3C naming scheme, for IDL generation.
     enum {
         SVG_ZOOMANDPAN_UNKNOWN = SVGZoomAndPanUnknown,
         SVG_ZOOMANDPAN_DISABLE = SVGZoomAndPanDisable,
         SVG_ZOOMANDPAN_MAGNIFY = SVGZoomAndPanMagnify
     };
 
     virtual ~SVGZoomAndPan() { }
 
     static bool isKnownAttribute(const QualifiedName&);
-    static void addSupportedAttributes(HashSet<QualifiedName>&);
 
     static SVGZoomAndPanType parseFromNumber(unsigned short number)
     {
         if (!number || number > SVGZoomAndPanMagnify)
             return SVGZoomAndPanUnknown;
         return static_cast<SVGZoomAndPanType>(number);
     }
 
     bool parseZoomAndPan(const LChar*& start, const LChar* end);
     bool parseZoomAndPan(const UChar*& start, const UChar* end);
@@ skipping 26 matching lines @@
     SVGZoomAndPan();
     void resetZoomAndPan();
 
 private:
     SVGZoomAndPanType m_zoomAndPan;
 };
 
 } // namespace blink
 
 #endif // SVGZoomAndPan_h