Reduce forward declarations in core/rendering

Source/core/rendering/svg/SVGInlineTextBox.h

 /*
  * Copyright (C) 2007 Rob Buis <buis@kde.org>
  * Copyright (C) 2007 Nikolas Zimmermann <zimmermann@kde.org>
  * 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.
  *
@@ skipping 11 matching lines @@
 #ifndef SVGInlineTextBox_h
 #define SVGInlineTextBox_h
 
 #include "core/rendering/InlineTextBox.h"
 #include "core/rendering/svg/RenderSVGResource.h"
 #include "core/rendering/svg/SVGTextLayoutEngine.h"
 
 namespace WebCore {
 
 class RenderSVGResource;
-class SVGRootInlineBox;
 
 class SVGInlineTextBox FINAL : public InlineTextBox {
 public:
     SVGInlineTextBox(RenderObject&);
 
     virtual bool isSVGInlineTextBox() const OVERRIDE { return true; }
 
     virtual float virtualLogicalHeight() const OVERRIDE { return m_logicalHeight; }
     void setLogicalHeight(float height) { m_logicalHeight = height; }
 
@@ skipping 49 matching lines @@
     bool m_startsNewTextChunk : 1;
     RenderSVGResource* m_paintingResource;
     Vector<SVGTextFragment> m_textFragments;
 };
 
 DEFINE_INLINE_BOX_TYPE_CASTS(SVGInlineTextBox);
 
 } // namespace WebCore
 
 #endif // SVGInlineTextBox_h