Prefer to forward-declare GraphicsContext in headers.

Source/core/rendering/svg/RenderSVGEllipse.cpp

 /*
  * Copyright (C) 2012 Google, Inc.
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 13 matching lines @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #include "config.h"
 
 #include "core/rendering/svg/RenderSVGEllipse.h"
 
 #include "SVGNames.h"
 #include "core/svg/SVGCircleElement.h"
 #include "core/svg/SVGEllipseElement.h"
+#include "platform/graphics/GraphicsContext.h"
 
 namespace WebCore {
 
 RenderSVGEllipse::RenderSVGEllipse(SVGGraphicsElement* node)
     : RenderSVGShape(node)
     , m_usePathFallback(false)
 {
 }
 
 RenderSVGEllipse::~RenderSVGEllipse()
@@ skipping 104 matching lines @@
     FloatPoint center = FloatPoint(m_center.x() - point.x(), m_center.y() - point.y());
 
     // This works by checking if the point satisfies the ellipse equation.
     // (x/rX)^2 + (y/rY)^2 <= 1
     float xrX = center.x() / m_radii.width();
     float yrY = center.y() / m_radii.height();
     return xrX * xrX + yrY * yrY <= 1.0;
 }
 
 }