Replace RenderArena with PartitionAlloc.

Source/core/svg/SVGSwitchElement.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 53 matching lines @@
         SVGElement* element = toSVGElement(node);
         if (!element || !element->isValid())
             continue;
 
         return node == childContext.node(); // Only allow this child if it's the first valid child
     }
 
     return false;
 }
 
-RenderObject* SVGSwitchElement::createRenderer(RenderArena* arena, RenderStyle*)
+RenderObject* SVGSwitchElement::createRenderer(RenderStyle*)
 {
-    return new (arena) RenderSVGTransformableContainer(this);
+    return new RenderSVGTransformableContainer(this);
 }
 
 }