Remove SVGElement::rendererIsNeeded

Source/core/svg/SVGSVGElement.cpp

 /*
  * Copyright (C) 2004, 2005, 2006 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2010 Rob Buis <buis@kde.org>
  * Copyright (C) 2007 Apple Inc. All rights reserved.
  * Copyright (C) 2014 Google, Inc.
  *
  * 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 511 matching lines @@
 
     return transform.multiply(viewBoxTransform);
 }
 
 bool SVGSVGElement::rendererIsNeeded(const RenderStyle& style)
 {
     // FIXME: We should respect display: none on the documentElement svg element
     // but many things in FrameView and SVGImage depend on the RenderSVGRoot when
     // they should instead depend on the RenderView.
     // https://bugs.webkit.org/show_bug.cgi?id=103493
+    if (!isValid())
+        return false;
     if (document().documentElement() == this)
         return true;
     return Element::rendererIsNeeded(style);
 }
 
 RenderObject* SVGSVGElement::createRenderer(RenderStyle*)
 {
     if (isOutermostSVGSVGElement())
         return new RenderSVGRoot(this);
 
@@ skipping 239 matching lines @@
 }
 
 void SVGSVGElement::trace(Visitor* visitor)
 {
     visitor->trace(m_timeContainer);
     visitor->trace(m_viewSpec);
     SVGGraphicsElement::trace(visitor);
 }
 
 }