Replace RenderArena with PartitionAlloc.

Source/core/rendering/RenderLayerModelObject.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2005 Allan Sandfeld Jensen (kde@carewolf.com)
  *           (C) 2005, 2006 Samuel Weinig (sam.weinig@gmail.com)
  * Copyright (C) 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
  * Copyright (C) 2010, 2012 Google Inc. 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
@@ skipping 36 matching lines @@
 {
     // Our layer should have been destroyed and cleared by now
     ASSERT(!hasLayer());
     ASSERT(!m_layer);
 }
 
 void RenderLayerModelObject::destroyLayer()
 {
     ASSERT(!hasLayer()); // Callers should have already called setHasLayer(false)
     ASSERT(m_layer);
-    m_layer->destroy(renderArena());
+    m_layer->destroy();
     m_layer = 0;
 }
 
 void RenderLayerModelObject::ensureLayer()
 {
     if (m_layer)
         return;
 
-    m_layer = new (renderArena()) RenderLayer(this);
+    m_layer = new RenderLayer(this);
     setHasLayer(true);
     m_layer->insertOnlyThisLayer();
 }
 
 bool RenderLayerModelObject::hasSelfPaintingLayer() const
 {
     return m_layer && m_layer->isSelfPaintingLayer();
 }
 
 void RenderLayerModelObject::willBeDestroyed()
@@ skipping 107 matching lines @@
 
 void RenderLayerModelObject::reportMemoryUsage(MemoryObjectInfo* memoryObjectInfo) const
 {
     MemoryClassInfo info(memoryObjectInfo, this, PlatformMemoryTypes::Rendering);
     RenderObject::reportMemoryUsage(memoryObjectInfo);
     info.addWeakPointer(m_layer);
 }
 
 } // namespace WebCore