Use toSVGPathElement() instead of static_cast<>

Source/core/rendering/svg/RenderSVGTextPath.cpp

 /*
  * Copyright (C) 2007 Nikolas Zimmermann <zimmermann@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
@@ skipping 22 matching lines @@
 {
 }
 
 Path RenderSVGTextPath::layoutPath() const
 {
     SVGTextPathElement* textPathElement = static_cast<SVGTextPathElement*>(node());
     Element* targetElement = SVGURIReference::targetElementFromIRIString(textPathElement->hrefCurrentValue(), textPathElement->document());
     if (!targetElement || !targetElement->hasTagName(SVGNames::pathTag))
         return Path();
     
-    SVGPathElement* pathElement = static_cast<SVGPathElement*>(targetElement);
+    SVGPathElement* pathElement = toSVGPathElement(targetElement);
     
     Path pathData;
     updatePathFromGraphicsElement(pathElement, pathData);
 
     // Spec:  The transform attribute on the referenced 'path' element represents a
     // supplemental transformation relative to the current user coordinate system for
     // the current 'text' element, including any adjustments to the current user coordinate
     // system due to a possible transform attribute on the current 'text' element.
     // http://www.w3.org/TR/SVG/text.html#TextPathElement
     pathData.transform(pathElement->animatedLocalTransform());
     return pathData;
 }
 
 float RenderSVGTextPath::startOffset() const
 {
     return static_cast<SVGTextPathElement*>(node())->startOffsetCurrentValue().valueAsPercentage();
 }
 
 bool RenderSVGTextPath::exactAlignment() const
 {
     return static_cast<SVGTextPathElement*>(node())->spacingCurrentValue() == SVGTextPathSpacingExact;
 }
 
 bool RenderSVGTextPath::stretchMethod() const
 {
     return static_cast<SVGTextPathElement*>(node())->methodCurrentValue() == SVGTextPathMethodStretch;
 }
 
 }