Replace RenderArena with PartitionAlloc

Source/core/svg/SVGPathElement.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 385 matching lines @@
     // FIXME: Eventually we should support getBBox for detached elements.
     if (!renderer)
         return FloatRect();
 
     return renderer->path().boundingRect();
 }
 
 RenderObject* SVGPathElement::createRenderer(RenderStyle*)
 {
     // By default, any subclass is expected to do path-based drawing
-    return new (document()->renderArena()) RenderSVGPath(this);
+    return new RenderSVGPath(this);
 }
 
 }