Add toSVGFontFaceUri|NameElement(), and use them.

Source/core/svg/SVGFontFaceSrcElement.cpp

 /*
  * Copyright (C) 2007 Eric Seidel <eric@webkit.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 33 matching lines @@
 {
     return adoptRef(new SVGFontFaceSrcElement(tagName, document));
 }
 
 PassRefPtr<CSSValueList> SVGFontFaceSrcElement::srcValue() const
 {
     RefPtr<CSSValueList> list = CSSValueList::createCommaSeparated();
     for (Node* child = firstChild(); child; child = child->nextSibling()) {
         RefPtr<CSSFontFaceSrcValue> srcValue;
         if (child->hasTagName(font_face_uriTag))
-            srcValue = static_cast<SVGFontFaceUriElement*>(child)->srcValue();
+            srcValue = toSVGFontFaceUriElement(child)->srcValue();
         else if (child->hasTagName(font_face_nameTag))
-            srcValue = static_cast<SVGFontFaceNameElement*>(child)->srcValue();
+            srcValue = toSVGFontFaceNameElement(child)->srcValue();
+
         if (srcValue && srcValue->resource().length())
             list->append(srcValue);
     }
     return list;
 }
 
 void SVGFontFaceSrcElement::childrenChanged(bool changedByParser, Node* beforeChange, Node* afterChange, int childCountDelta)
 {
     SVGElement::childrenChanged(changedByParser, beforeChange, afterChange, childCountDelta);
     if (parentNode() && parentNode()->hasTagName(font_faceTag))
         toSVGFontFaceElement(parentNode())->rebuildFontFace();
 }
 
 }
 
 #endif // ENABLE(SVG_FONTS)