Remove some dead code in SVG "mixins"

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

 /*
  * Copyright (C) 2004, 2005, 2008 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2004, 2005, 2006, 2010 Rob Buis <buis@kde.org>
  *
  * 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 SVGTests_h
 #define SVGTests_h
 
 #include "core/CoreExport.h"
 #include "core/svg/SVGStaticStringList.h"
 #include "platform/heap/Handle.h"
-#include "wtf/HashSet.h"
 
 namespace blink {
 
 class Document;
 class QualifiedName;
 class SVGElement;
 
 class CORE_EXPORT SVGTests : public WillBeGarbageCollectedMixin {
 public:
     // JS API
     SVGStringListTearOff* requiredFeatures() { return m_requiredFeatures->tearOff(); }
     SVGStringListTearOff* requiredExtensions() { return m_requiredExtensions->tearOff(); }
     SVGStringListTearOff* systemLanguage() { return m_systemLanguage->tearOff(); }
 
-    bool isValid(Document&) const;
+    bool isValid() const;
 
-    bool parseAttribute(const QualifiedName&, const AtomicString&);
     bool isKnownAttribute(const QualifiedName&);
 
-    void addSupportedAttributes(HashSet<QualifiedName>&);
-
     DECLARE_VIRTUAL_TRACE();
 
 protected:
     explicit SVGTests(SVGElement* contextElement);
 
 private:
     RefPtrWillBeMember<SVGStaticStringList> m_requiredFeatures;
     RefPtrWillBeMember<SVGStaticStringList> m_requiredExtensions;
     RefPtrWillBeMember<SVGStaticStringList> m_systemLanguage;
 };
 
 } // namespace blink
 
 #endif // SVGTests_h