Replace RenderArena with PartitionAlloc.

Source/core/svg/SVGDefsElement.cpp

 /*
  * Copyright (C) 2004, 2005 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2004, 2005, 2006 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 36 matching lines @@
 PassRefPtr<SVGDefsElement> SVGDefsElement::create(const QualifiedName& tagName, Document* document)
 {
     return adoptRef(new SVGDefsElement(tagName, document));
 }
 
 bool SVGDefsElement::isValid() const
 {
     return SVGTests::isValid();
 }
 
-RenderObject* SVGDefsElement::createRenderer(RenderArena* arena, RenderStyle*)
+RenderObject* SVGDefsElement::createRenderer(RenderStyle*)
 {
-    return new (arena) RenderSVGHiddenContainer(this);
+    return new RenderSVGHiddenContainer(this);
 }
 
 }