Replace RenderArena with PartitionAlloc.

Source/core/html/HTMLDetailsElement.cpp

 /*
  * Copyright (C) 2010, 2011 Nokia Corporation and/or its subsidiary(-ies)
  *
  * 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,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 37 matching lines @@
 }
 
 HTMLDetailsElement::HTMLDetailsElement(const QualifiedName& tagName, Document* document)
     : HTMLElement(tagName, document)
     , m_isOpen(false)
 {
     ASSERT(hasTagName(detailsTag));
     ScriptWrappable::init(this);
 }
 
-RenderObject* HTMLDetailsElement::createRenderer(RenderArena* arena, RenderStyle*)
+RenderObject* HTMLDetailsElement::createRenderer(RenderStyle*)
 {
-    return new (arena) RenderBlock(this);
+    return new RenderBlock(this);
 }
 
 void HTMLDetailsElement::didAddUserAgentShadowRoot(ShadowRoot* root)
 {
     RefPtr<HTMLSummaryElement> defaultSummary = HTMLSummaryElement::create(summaryTag, document());
     defaultSummary->appendChild(Text::create(document(), defaultDetailsSummaryText()), ASSERT_NO_EXCEPTION);
 
     RefPtr<HTMLContentElement> content = HTMLContentElement::create(document());
     content->setSelect(summaryQuerySelector());
     content->appendChild(defaultSummary);
@@ skipping 38 matching lines @@
 
     return childContext.node() == findMainSummary() && HTMLElement::childShouldCreateRenderer(childContext);
 }
 
 void HTMLDetailsElement::toggleOpen()
 {
     setAttribute(openAttr, m_isOpen ? nullAtom : emptyAtom);
 }
 
 }