Use isSVG*Element() helpers more in SVG code (Part 3)

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 23 matching lines @@
 {
 }
 
 bool RenderSVGTextPath::isChildAllowed(RenderObject* child, RenderStyle*) const
 {
     if (child->isText())
         return SVGRenderSupport::isRenderableTextNode(child);
 
 #if ENABLE(SVG_FONTS)
     // 'altGlyph' is supported by the content model for 'textPath', but...
-    if (child->node()->hasTagName(SVGNames::altGlyphTag))
+    ASSERT(child->node());
+    if (isSVGAltGlyphElement(*child->node()))
         return false;
 #endif
 
     return child->isSVGInline() && !child->isSVGTextPath();
 }
 
 Path RenderSVGTextPath::layoutPath() const
 {
     SVGTextPathElement* textPathElement = toSVGTextPathElement(node());
     Element* targetElement = SVGURIReference::targetElementFromIRIString(textPathElement->href()->currentValue()->value(), textPathElement->document());
-    if (!targetElement || !targetElement->hasTagName(SVGNames::pathTag))
+    if (!isSVGPathElement(targetElement))
         return Path();
 
-    SVGPathElement* pathElement = toSVGPathElement(targetElement);
+    SVGPathElement& pathElement = toSVGPathElement(*targetElement);
 
     Path pathData;
-    updatePathFromGraphicsElement(pathElement, 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());
+    pathData.transform(pathElement.animatedLocalTransform());
     return pathData;
 }
 
 float RenderSVGTextPath::startOffset() const
 {
     return toSVGTextPathElement(node())->startOffset()->currentValue()->valueAsPercentage();
 }
 
 }