Don't unconditionally create a LayoutObject for SVGMarkerElement.

third_party/WebKit/Source/core/svg/SVGMarkerElement.cpp

 /*
  * Copyright (C) 2004, 2005, 2006, 2007, 2008 Nikolas Zimmermann
  * <zimmermann@kde.org>
  * Copyright (C) 2004, 2005, 2006, 2007 Rob Buis <buis@kde.org>
  * Copyright (C) Research In Motion Limited 2009-2010. 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 140 matching lines @@
   return new LayoutSVGResourceMarker(this);
 }
 
 bool SVGMarkerElement::selfHasRelativeLengths() const {
   return m_refX->currentValue()->isRelative() ||
          m_refY->currentValue()->isRelative() ||
          m_markerWidth->currentValue()->isRelative() ||
          m_markerHeight->currentValue()->isRelative();
 }
 
+bool SVGMarkerElement::layoutObjectIsNeeded(const ComputedStyle&) {
+  ContainerNode* parent = FlatTreeTraversal::parent(*this);
+  return parent && parent->isSVGElement() && isValid();
+}
+
 }  // namespace blink