Introduce toSVGRectElement(), use it

Source/core/rendering/svg/RenderSVGRect.cpp

 /*
  * Copyright (C) 2011 University of Szeged
  * Copyright (C) 2011 Renata Hodovan <reni@webkit.org>
  * 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.
@@ skipping 32 matching lines @@
 {
 }
 
 void RenderSVGRect::updateShapeFromElement()
 {
     // Before creating a new object we need to clear the cached bounding box
     // to avoid using garbage.
     m_fillBoundingBox = FloatRect();
     m_innerStrokeRect = FloatRect();
     m_outerStrokeRect = FloatRect();
-    SVGRectElement* rect = static_cast<SVGRectElement*>(node());
+    SVGRectElement* rect = toSVGRectElement(node());
     ASSERT(rect);
 
     SVGLengthContext lengthContext(rect);
     // Fallback to RenderSVGShape if rect has rounded corners or a non-scaling stroke.
     if (rect->rxCurrentValue().value(lengthContext) > 0 || rect->ryCurrentValue().value(lengthContext) > 0 || hasNonScalingStroke()) {
         RenderSVGShape::updateShapeFromElement();
         m_usePathFallback = true;
         return;
     }
 
@@ skipping 55 matching lines @@
 }
 
 bool RenderSVGRect::shapeDependentFillContains(const FloatPoint& point, const WindRule fillRule) const
 {
     if (m_usePathFallback)
         return RenderSVGShape::shapeDependentFillContains(point, fillRule);
     return m_fillBoundingBox.contains(point.x(), point.y());
 }
 
 }