Clean up forward declarations in core/rendering and core/painting

Source/core/paint/SVGInlineTextBoxPainter.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef SVGInlineTextBoxPainter_h
 #define SVGInlineTextBoxPainter_h
 
 #include "core/rendering/style/RenderStyleConstants.h"
 #include "core/rendering/svg/RenderSVGResourcePaintServer.h"
 
 namespace blink {
 
 class FloatPoint;
 class Font;
 class GraphicsContext;
 struct PaintInfo;
 class LayoutPoint;
 class RenderStyle;
-class RenderObject;
 class SVGInlineTextBox;
 struct SVGTextFragment;
 class TextRun;
 class DocumentMarker;
 
 class SVGInlineTextBoxPainter {
 public:
     SVGInlineTextBoxPainter(SVGInlineTextBox& svgInlineTextBox) : m_svgInlineTextBox(svgInlineTextBox) { }
     void paint(PaintInfo&, const LayoutPoint&);
     void paintSelectionBackground(PaintInfo&);
     virtual void paintTextMatchMarker(GraphicsContext*, const FloatPoint&, DocumentMarker*, RenderStyle*, const Font&);
 
 private:
     void paintDecoration(GraphicsContext*, TextDecoration, const SVGTextFragment&);
     void paintTextWithShadows(GraphicsContext*, RenderStyle*, TextRun&, const SVGTextFragment&, int startPosition, int endPosition, RenderSVGResourceMode);
     void paintText(GraphicsContext*, RenderStyle*, RenderStyle* selectionStyle, const SVGTextFragment&, RenderSVGResourceMode, bool hasSelection, bool paintSelectedTextOnly);
 
     SVGInlineTextBox& m_svgInlineTextBox;
 };
 
 } // namespace blink
 
 #endif // SVGInlineTextBoxPainter_h