Use svg casting function instead of static_cast<>

Source/core/rendering/svg/SVGRenderTreeAsText.cpp

 /*
  * Copyright (C) 2004, 2005, 2007, 2009 Apple Inc. All rights reserved.
  *           (C) 2005 Rob Buis <buis@kde.org>
  *           (C) 2006 Alexander Kellett <lypanov@kde.org>
  * Copyright (C) Research In Motion Limited 2010. 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
@@ skipping 336 matching lines @@
         writeNameValuePair(ts, "cx", element->cxCurrentValue().value(lengthContext));
         writeNameValuePair(ts, "cy", element->cyCurrentValue().value(lengthContext));
         writeNameValuePair(ts, "rx", element->rxCurrentValue().value(lengthContext));
         writeNameValuePair(ts, "ry", element->ryCurrentValue().value(lengthContext));
     } else if (svgElement->hasTagName(SVGNames::circleTag)) {
         SVGCircleElement* element = static_cast<SVGCircleElement*>(svgElement);
         writeNameValuePair(ts, "cx", element->cxCurrentValue().value(lengthContext));
         writeNameValuePair(ts, "cy", element->cyCurrentValue().value(lengthContext));
         writeNameValuePair(ts, "r", element->rCurrentValue().value(lengthContext));
     } else if (svgElement->hasTagName(SVGNames::polygonTag) || svgElement->hasTagName(SVGNames::polylineTag)) {
-        SVGPolyElement* element = static_cast<SVGPolyElement*>(svgElement);
-        writeNameAndQuotedValue(ts, "points", element->pointList().valueAsString());
+        writeNameAndQuotedValue(ts, "points", toSVGPolyElement(svgElement)->pointList().valueAsString());
     } else if (svgElement->hasTagName(SVGNames::pathTag)) {
-        SVGPathElement* element = toSVGPathElement(svgElement);
         String pathString;
         // FIXME: We should switch to UnalteredParsing here - this will affect the path dumping output of dozens of tests.
-        buildStringFromByteStream(element->pathByteStream(), pathString, NormalizedParsing);
+        buildStringFromByteStream(toSVGPathElement(svgElement)->pathByteStream(), pathString, NormalizedParsing);
         writeNameAndQuotedValue(ts, "data", pathString);
     } else
         ASSERT_NOT_REACHED();
     return ts;
 }
 
 static TextStream& operator<<(TextStream& ts, const RenderSVGRoot& root)
 {
     return writePositionAndStyle(ts, root);
 }
@@ skipping 295 matching lines @@
             ts << " ";
             writeNameAndQuotedValue(ts, "filter", svgStyle->filterResource());
             ts << " ";
             writeStandardPrefix(ts, *filter, 0);
             ts << " " << filter->resourceBoundingBox(&renderer) << "\n";
         }
     }
 }
 
 } // namespace WebCore