Remove support for the externalResourcesRequired attribute.

Source/core/svg/SVGFEImageElement.h

 /*
  * Copyright (C) 2004, 2005, 2007 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2004, 2005 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 SVGFEImageElement_h
 #define SVGFEImageElement_h
 
 #include "SVGNames.h"
 #include "core/fetch/ImageResource.h"
 #include "core/fetch/ResourcePtr.h"
 #include "core/svg/SVGAnimatedBoolean.h"
 #include "core/svg/SVGAnimatedPreserveAspectRatio.h"
-#include "core/svg/SVGExternalResourcesRequired.h"
 #include "core/svg/SVGFilterPrimitiveStandardAttributes.h"
 #include "core/svg/SVGURIReference.h"
 #include "core/svg/graphics/filters/SVGFEImage.h"
 #include "platform/graphics/ImageBuffer.h"
 
 namespace WebCore {
 
 class SVGFEImageElement FINAL : public SVGFilterPrimitiveStandardAttributes,
                                 public SVGURIReference,
-                                public SVGExternalResourcesRequired,
                                 public ImageResourceClient {
 public:
     static PassRefPtr<SVGFEImageElement> create(Document&);
 
     bool currentFrameHasSingleSecurityOrigin() const;
 
     virtual ~SVGFEImageElement();
 
 private:
     explicit SVGFEImageElement(Document&);
 
     bool isSupportedAttribute(const QualifiedName&);
     virtual void parseAttribute(const QualifiedName&, const AtomicString&) OVERRIDE;
     virtual void svgAttributeChanged(const QualifiedName&);
     virtual void notifyFinished(Resource*);
 
     virtual PassRefPtr<FilterEffect> build(SVGFilterBuilder*, Filter*);
 
     void clearResourceReferences();
     void fetchImageResource();
 
     virtual void buildPendingResource();
     virtual InsertionNotificationRequest insertedInto(ContainerNode*) OVERRIDE;
     virtual void removedFrom(ContainerNode*) OVERRIDE;
 
     BEGIN_DECLARE_ANIMATED_PROPERTIES(SVGFEImageElement)
         DECLARE_ANIMATED_PRESERVEASPECTRATIO(PreserveAspectRatio, preserveAspectRatio)
         DECLARE_ANIMATED_STRING(Href, href)
-        DECLARE_ANIMATED_BOOLEAN(ExternalResourcesRequired, externalResourcesRequired)
     END_DECLARE_ANIMATED_PROPERTIES
 
     ResourcePtr<ImageResource> m_cachedImage;
 };
 
 DEFINE_NODE_TYPE_CASTS(SVGFEImageElement, hasTagName(SVGNames::feImageTag));
 
 } // namespace WebCore
 
 #endif