Replace RenderArena with PartitionAlloc.

Source/core/html/HTMLCanvasElement.cpp

 /*
  * Copyright (C) 2004, 2006, 2007 Apple Inc. All rights reserved.
  * Copyright (C) 2007 Alp Toker <alp@atoker.com>
  * Copyright (C) 2010 Torch Mobile (Beijing) Co. Ltd. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
@@ skipping 89 matching lines @@
     m_context.clear(); // Ensure this goes away before the ImageBuffer.
 }
 
 void HTMLCanvasElement::parseAttribute(const QualifiedName& name, const AtomicString& value)
 {
     if (name == widthAttr || name == heightAttr)
         reset();
     HTMLElement::parseAttribute(name, value);
 }
 
-RenderObject* HTMLCanvasElement::createRenderer(RenderArena* arena, RenderStyle* style)
+RenderObject* HTMLCanvasElement::createRenderer(RenderStyle* style)
 {
     Frame* frame = document()->frame();
     if (frame && frame->script()->canExecuteScripts(NotAboutToExecuteScript)) {
         m_rendererIsCanvas = true;
-        return new (arena) RenderHTMLCanvas(this);
+        return new RenderHTMLCanvas(this);
     }
 
     m_rendererIsCanvas = false;
-    return HTMLElement::createRenderer(arena, style);
+    return HTMLElement::createRenderer(style);
 }
 
 void HTMLCanvasElement::attach(const AttachContext& context)
 {
     setIsInCanvasSubtree(true);
     HTMLElement::attach(context);
 }
 
 void HTMLCanvasElement::addObserver(CanvasObserver* observer)
 {
@@ skipping 451 matching lines @@
     HTMLElement::reportMemoryUsage(memoryObjectInfo);
     info.addMember(m_observers, "observers");
     info.addMember(m_context, "context");
     info.addMember(m_imageBuffer, "imageBuffer");
     info.addMember(m_contextStateSaver, "contextStateSaver");
     info.addMember(m_presentedImage, "presentedImage");
     info.addMember(m_copiedImage, "copiedImage");
 }
 
 }