Generate toSVGFooElement() for SVGFELight|AnimateMotion|FontFaceSrc|TextPositioningElement

Source/core/svg/SVGFontFaceElement.cpp

Index: Source/core/svg/SVGFontFaceElement.cpp
diff --git a/Source/core/svg/SVGFontFaceElement.cpp b/Source/core/svg/SVGFontFaceElement.cpp
index 0ed949ca99fc1bc6aec9656d8c55615eb0ab0251..7cdcffd39115c7508abec6d26552a78b56c7e60c 100644
--- a/Source/core/svg/SVGFontFaceElement.cpp
+++ b/Source/core/svg/SVGFontFaceElement.cpp
@@ -286,7 +286,7 @@ void SVGFontFaceElement::rebuildFontFace()
         // we currently ignore all but the last src element, alternatively we could concat them
         for (Node* child = lastChild(); child && !list; child = child->previousSibling()) {
             if (child->hasTagName(font_face_srcTag)) {
-                list = static_cast<SVGFontFaceSrcElement*>(child)->srcValue();
+                list = toSVGFontFaceSrcElement(child)->srcValue();
                 break;
             }
         }