Reduce number of header includes in SVG

Source/core/svg/SVGPathTraversalStateBuilder.h

 /*
  * Copyright (C) 2007 Eric Seidel <eric@webkit.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.
  *
  * 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 SVGPathTraversalStateBuilder_h
 #define SVGPathTraversalStateBuilder_h
 
 #include "core/platform/graphics/FloatPoint.h"
-#include "core/platform/graphics/PathTraversalState.h"
 #include "core/svg/SVGPathConsumer.h"
 
 namespace WebCore {
 
+class PathTraversalState;
+
 class SVGPathTraversalStateBuilder : public SVGPathConsumer {
 public:
     SVGPathTraversalStateBuilder();
 
     unsigned pathSegmentIndex();
     float totalLength();
     FloatPoint currentPoint();
 
     void setCurrentTraversalState(PathTraversalState* traversalState) { m_traversalState = traversalState; }
     void setDesiredLength(float);
@@ skipping 16 matching lines @@
     virtual void curveToQuadratic(const FloatPoint&, const FloatPoint&, PathCoordinateMode) { ASSERT_NOT_REACHED(); }
     virtual void curveToQuadraticSmooth(const FloatPoint&, PathCoordinateMode) { ASSERT_NOT_REACHED(); }
     virtual void arcTo(float, float, float, bool, bool, const FloatPoint&, PathCoordinateMode) { ASSERT_NOT_REACHED(); }
 
     PathTraversalState* m_traversalState;
 };
 
 } // namespace WebCore
 
 #endif // SVGPathTraversalStateBuilder_h