Replace RenderArena with PartitionAlloc.

Source/core/svg/SVGCircleElement.cpp

 /*
  * Copyright (C) 2004, 2005, 2006, 2008 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2004, 2005, 2006, 2007 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 122 matching lines @@
     ASSERT_NOT_REACHED();
 }
 
 bool SVGCircleElement::selfHasRelativeLengths() const
 {
     return cx().isRelative()
         || cy().isRelative()
         || r().isRelative();
 }
 
-RenderObject* SVGCircleElement::createRenderer(RenderArena* arena, RenderStyle*)
+RenderObject* SVGCircleElement::createRenderer(RenderStyle*)
 {
-    return new (arena) RenderSVGEllipse(this);
+    return new RenderSVGEllipse(this);
 }
 
 }