Remove support for the externalResourcesRequired attribute.

Source/core/svg/SVGCursorElement.h

 /*
  * Copyright (C) 2004, 2005, 2006, 2008 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2004, 2005, 2006 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 SVGCursorElement_h
 #define SVGCursorElement_h
 
 #include "core/svg/SVGAnimatedBoolean.h"
 #include "core/svg/SVGAnimatedLength.h"
 #include "core/svg/SVGAnimatedString.h"
 #include "core/svg/SVGElement.h"
-#include "core/svg/SVGExternalResourcesRequired.h"
 #include "core/svg/SVGTests.h"
 #include "core/svg/SVGURIReference.h"
 
 namespace WebCore {
 
 class SVGCursorElement FINAL : public SVGElement,
                                public SVGTests,
-                               public SVGExternalResourcesRequired,
                                public SVGURIReference {
 public:
     static PassRefPtr<SVGCursorElement> create(const QualifiedName&, Document&);
 
     virtual ~SVGCursorElement();
 
     void addClient(SVGElement*);
     void removeClient(SVGElement*);
     void removeReferencedElement(SVGElement*);
 
 private:
     SVGCursorElement(const QualifiedName&, Document&);
 
     virtual bool isValid() const { return SVGTests::isValid(); }
 
     bool isSupportedAttribute(const QualifiedName&);
     virtual void parseAttribute(const QualifiedName&, const AtomicString&) OVERRIDE;
     virtual void svgAttributeChanged(const QualifiedName&);
 
     virtual void addSubresourceAttributeURLs(ListHashSet<KURL>&) const;
 
     virtual bool rendererIsNeeded(const RenderStyle&) OVERRIDE { return false; }
 
     BEGIN_DECLARE_ANIMATED_PROPERTIES(SVGCursorElement)
         DECLARE_ANIMATED_LENGTH(X, x)
         DECLARE_ANIMATED_LENGTH(Y, y)
         DECLARE_ANIMATED_STRING(Href, href)
-        DECLARE_ANIMATED_BOOLEAN(ExternalResourcesRequired, externalResourcesRequired)
     END_DECLARE_ANIMATED_PROPERTIES
 
     // SVGTests
     virtual void synchronizeRequiredFeatures() { SVGTests::synchronizeRequiredFeatures(this); }
     virtual void synchronizeRequiredExtensions() { SVGTests::synchronizeRequiredExtensions(this); }
     virtual void synchronizeSystemLanguage() { SVGTests::synchronizeSystemLanguage(this); }
 
     HashSet<SVGElement*> m_clients;
 };
 
 } // namespace WebCore
 
 #endif