Use isSVG*Element() helpers more in SVG code (Part 2)

Source/core/svg/SVGTextContentElement.cpp

 /*
  * Copyright (C) 2004, 2005, 2007, 2008 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2004, 2005, 2006, 2007, 2008 Rob Buis <buis@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,
@@ skipping 262 matching lines @@
 SVGTextContentElement* SVGTextContentElement::elementFromRenderer(RenderObject* renderer)
 {
     if (!renderer)
         return 0;
 
     if (!renderer->isSVGText() && !renderer->isSVGInline())
         return 0;
 
     SVGElement* element = toSVGElement(renderer->node());
     ASSERT(element);
-
-    if (!element->isTextContent())
-        return 0;
-
-    return toSVGTextContentElement(element);
+    return isSVGTextContentElement(*element) ? toSVGTextContentElement(element) : 0;
 }
 
 }