Reduce forward declarations in core/rendering

Source/core/rendering/svg/SVGRenderSupport.h

 /**
  * Copyright (C) 2007 Rob Buis <buis@kde.org>
  * Copyright (C) 2007 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2007 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2009 Google, Inc.  All rights reserved.
  * 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
@@ skipping 12 matching lines @@
 
 #ifndef SVGRenderSupport_h
 #define SVGRenderSupport_h
 
 namespace WebCore {
 
 class AffineTransform;
 class FloatPoint;
 class FloatRect;
 class GraphicsContext;
-class ImageBuffer;
 class LayoutRect;
 struct PaintInfo;
-class RenderBoxModelObject;
 class RenderGeometryMap;
 class RenderLayerModelObject;
 class RenderObject;
 class RenderStyle;
 class RenderSVGRoot;
 class StrokeData;
 class TransformState;
 
 class SVGRenderSupport {
 public:
@@ skipping 44 matching lines @@
 
 private:
     static void updateObjectBoundingBox(FloatRect& objectBoundingBox, bool& objectBoundingBoxValid, RenderObject* other, FloatRect otherBoundingBox);
     static void invalidateResourcesOfChildren(RenderObject* start);
     static bool layoutSizeOfNearestViewportChanged(const RenderObject* start);
 };
 
 } // namespace WebCore
 
 #endif // SVGRenderSupport_h