Revert of Convert remaining RenderSVG* nodes to RenderObject::isChildAllowed

Source/core/svg/SVGAElement.cpp

 /*
  * Copyright (C) 2004, 2005, 2008 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2004, 2005, 2007 Rob Buis <buis@kde.org>
  * Copyright (C) 2007 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2010 Apple Inc. All rights reserved.
  *
  * 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 203 matching lines @@
 bool SVGAElement::isKeyboardFocusable() const
 {
     if (!isFocusable())
         return false;
 
     if (Page* page = document().page())
         return page->chrome().client().tabsToLinks();
     return false;
 }
 
+bool SVGAElement::childShouldCreateRenderer(const Node& child) const
+{
+    // http://www.w3.org/2003/01/REC-SVG11-20030114-errata#linking-text-environment
+    // The 'a' element may contain any element that its parent may contain, except itself.
+    if (child.hasTagName(SVGNames::aTag))
+        return false;
+    if (parentNode() && parentNode()->isSVGElement())
+        return toSVGElement(parentNode())->childShouldCreateRenderer(child);
+
+    return SVGGraphicsElement::childShouldCreateRenderer(child);
+}
+
 bool SVGAElement::willRespondToMouseClickEvents()
 {
     return isLink() || SVGGraphicsElement::willRespondToMouseClickEvents();
 }
 
 } // namespace WebCore