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 93 matching lines @@
     if (name == widthAttr || name == heightAttr)
         reset();
     HTMLElement::parseAttribute(name, value);
 }
 
 RenderObject* HTMLCanvasElement::createRenderer(RenderStyle* style)
 {
     Frame* frame = document()->frame();
     if (frame && frame->script()->canExecuteScripts(NotAboutToExecuteScript)) {
         m_rendererIsCanvas = true;
-        return new (document()->renderArena()) RenderHTMLCanvas(this);
+        return new RenderHTMLCanvas(this);
     }
 
     m_rendererIsCanvas = false;
     return HTMLElement::createRenderer(style);
 }
 
 void HTMLCanvasElement::attach(const AttachContext& context)
 {
     setIsInCanvasSubtree(true);
     HTMLElement::attach(context);
@@ skipping 434 matching lines @@
     FloatSize unscaledSize = size();
     FloatSize deviceSize = convertLogicalToDevice(unscaledSize);
     IntSize size(deviceSize.width(), deviceSize.height());
     AffineTransform transform;
     if (size.width() && size.height())
         transform.scaleNonUniform(size.width() / unscaledSize.width(), size.height() / unscaledSize.height());
     return m_imageBuffer->baseTransform() * transform;
 }
 
 }