Don't register excessive pending SVG resources

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 74 matching lines @@
     void markClientForInvalidation(LayoutObject*, InvalidationMode);
 
     void willBeDestroyed() override;
 
     bool m_isInLayout;
 
 private:
     friend class SVGResourcesCache;
     void addClient(LayoutObject*);
     void removeClient(LayoutObject*);
+    void detachAllClients();
 
     void registerResource();
 
     AtomicString m_id;
     // Track global (markAllClientsForInvalidation) invals to avoid redundant crawls.
     unsigned m_invalidationMask : 8;
 
     unsigned m_registered : 1;
     unsigned m_isInvalidating : 1;
     // 22 padding bits available
@@ skipping 24 matching lines @@
 }
 
 DEFINE_LAYOUT_OBJECT_TYPE_CASTS(LayoutSVGResourceContainer, isSVGResourceContainer());
 
 #define DEFINE_LAYOUT_SVG_RESOURCE_TYPE_CASTS(thisType, typeName) \
     DEFINE_TYPE_CASTS(thisType, LayoutSVGResourceContainer, resource, resource->resourceType() == typeName, resource.resourceType() == typeName)
 
 }
 
 #endif