Use an SVGElementProxy in ReferenceClipPathOperation

third_party/WebKit/Source/core/layout/svg/LayoutSVGResourceContainer.h

 /*
  * Copyright (C) Research In Motion Limited 2010. 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
@@ skipping 69 matching lines @@
     PaintInvalidation = 1 << 2,
     ParentOnlyInvalidation = 1 << 3
   };
 
   // Used from the invalidateClient/invalidateClients methods from classes,
   // inheriting from us.
   void markAllClientsForInvalidation(InvalidationMode);
   void markClientForInvalidation(LayoutObject*, InvalidationMode);
 
   void notifyContentChanged();
-  virtual SVGElementProxySet* elementProxySet() { return nullptr; }
+  SVGElementProxySet* elementProxySet();
 
   void willBeDestroyed() override;
 
   bool m_isInLayout;
 
  private:
   friend class SVGResourcesCache;
   void addClient(LayoutObject*);
   void removeClient(LayoutObject*);
   void detachAllClients();
@@ skipping 39 matching lines @@
                                 isSVGResourceContainer());
 
 #define DEFINE_LAYOUT_SVG_RESOURCE_TYPE_CASTS(thisType, typeName)   \
   DEFINE_TYPE_CASTS(thisType, LayoutSVGResourceContainer, resource, \
                     resource->resourceType() == typeName,           \
                     resource.resourceType() == typeName)
 
 }  // namespace blink
 
 #endif