Reduce forward declarations in core/rendering

Source/core/rendering/svg/RenderSVGInlineText.h

 /*
  * Copyright (C) 2006 Oliver Hunt <ojh16@student.canterbury.ac.nz>
  * Copyright (C) 2006, 2008 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Rob Buis <buis@kde.org>
  *
  * 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
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Library General Public License for more details.
  *
  * You should have received a copy of the GNU Library General Public License
  * along with this library; see the file COPYING.LIB.  If not, write to
  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  * Boston, MA 02110-1301, USA.
  */
 
 #ifndef RenderSVGInlineText_h
 #define RenderSVGInlineText_h
 
 #include "core/rendering/RenderText.h"
 #include "core/rendering/svg/SVGTextLayoutAttributes.h"
 
 namespace WebCore {
 
-class SVGInlineTextBox;
-
 class RenderSVGInlineText FINAL : public RenderText {
 public:
     RenderSVGInlineText(Node*, PassRefPtr<StringImpl>);
 
     bool characterStartsNewTextChunk(int position) const;
     SVGTextLayoutAttributes* layoutAttributes() { return &m_layoutAttributes; }
 
     float scalingFactor() const { return m_scalingFactor; }
     const Font& scaledFont() const { return m_scaledFont; }
     void updateScaledFont();
@@ skipping 21 matching lines @@
     float m_scalingFactor;
     Font m_scaledFont;
     SVGTextLayoutAttributes m_layoutAttributes;
 };
 
 DEFINE_RENDER_OBJECT_TYPE_CASTS(RenderSVGInlineText, isSVGInlineText());
 
 }
 
 #endif // RenderSVGInlineText_h