Introduce isSVGFontElement() and isSVGImageElement(), and use them

Source/core/svg/SVGImageElement.cpp

 /*
  * Copyright (C) 2004, 2005, 2006, 2008 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009 Rob Buis <buis@kde.org>
  * Copyright (C) 2006 Alexander Kellett <lypanov@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.
  *
@@ skipping 43 matching lines @@
 END_REGISTER_ANIMATED_PROPERTIES
 
 inline SVGImageElement::SVGImageElement(const QualifiedName& tagName, Document* document)
     : SVGGraphicsElement(tagName, document)
     , m_x(LengthModeWidth)
     , m_y(LengthModeHeight)
     , m_width(LengthModeWidth)
     , m_height(LengthModeHeight)
     , m_imageLoader(this)
 {
-    ASSERT(hasTagName(SVGNames::imageTag));
+    ASSERT(isSVGImageElement(this));
     ScriptWrappable::init(this);
     registerAnimatedPropertiesForSVGImageElement();
 }
 
 PassRefPtr<SVGImageElement> SVGImageElement::create(const QualifiedName& tagName, Document* document)
 {
     return adoptRef(new SVGImageElement(tagName, document));
 }
 
 bool SVGImageElement::isSupportedAttribute(const QualifiedName& attrName)
@@ skipping 151 matching lines @@
     addSubresourceURL(urls, document()->completeURL(href()));
 }
 
 void SVGImageElement::didMoveToNewDocument(Document* oldDocument)
 {
     m_imageLoader.elementDidMoveToNewDocument();
     SVGGraphicsElement::didMoveToNewDocument(oldDocument);
 }
 
 }