Clean up forward declarations in Source/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 21 matching lines @@
 class GraphicsContext;
 class PaintInvalidationState;
 class LayoutRect;
 struct PaintInfo;
 class Path;
 class RenderGeometryMap;
 class RenderLayerModelObject;
 class RenderObject;
 class RenderStyle;
 class RenderSVGRoot;
-class RenderSVGShape;
 class StrokeData;
 class TransformState;
 
 class SVGRenderSupport {
 public:
     // Shares child layouting code between RenderSVGRoot/RenderSVG(Hidden)Container
     static void layoutChildren(RenderObject*, bool selfNeedsLayout);
 
     // Layout resources used by this node.
     static void layoutResourcesIfNeeded(const RenderObject*);
@@ skipping 43 matching lines @@
     static bool isRenderableTextNode(const RenderObject*);
 
 private:
     static void updateObjectBoundingBox(FloatRect& objectBoundingBox, bool& objectBoundingBoxValid, RenderObject* other, FloatRect otherBoundingBox);
     static bool layoutSizeOfNearestViewportChanged(const RenderObject* start);
 };
 
 } // namespace blink
 
 #endif // SVGRenderSupport_h