Reduce forward declarations in core/rendering

Source/core/rendering/svg/SVGResources.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 10 matching lines @@
 #define SVGResources_h
 
 #include "wtf/FastAllocBase.h"
 #include "wtf/HashSet.h"
 #include "wtf/Noncopyable.h"
 #include "wtf/OwnPtr.h"
 #include "wtf/PassOwnPtr.h"
 
 namespace WebCore {
 
-class Document;
 class RenderObject;
 class RenderSVGResourceClipper;
 class RenderSVGResourceContainer;
 class RenderSVGResourceFilter;
 class RenderSVGResourceMarker;
 class RenderSVGResourceMasker;
 class SVGElement;
 class SVGRenderStyle;
 
 // Holds a set of resources associated with a RenderObject
@@ skipping 135 matching lines @@
 
     OwnPtr<ClipperFilterMaskerData> m_clipperFilterMaskerData;
     OwnPtr<MarkerData> m_markerData;
     OwnPtr<FillStrokeData> m_fillStrokeData;
     RenderSVGResourceContainer* m_linkedResource;
 };
 
 }
 
 #endif