Replace RenderArena with PartitionAlloc.

Source/core/dom/Element.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Peter Kelly (pmk@post.com)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  *           (C) 2007 David Smith (catfish.man@gmail.com)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2012, 2013 Apple Inc. All rights reserved.
  *           (C) 2007 Eric Seidel (eric@webkit.org)
  *
  * This library is free software; you can redistribute it and/or
@@ skipping 1150 matching lines @@
 const AtomicString& Element::imageSourceURL() const
 {
     return getAttribute(srcAttr);
 }
 
 bool Element::rendererIsNeeded(const NodeRenderingContext& context)
 {
     return context.style()->display() != NONE;
 }
 
-RenderObject* Element::createRenderer(RenderArena*, RenderStyle* style)
+RenderObject* Element::createRenderer(RenderStyle* style)
 {
     return RenderObject::createObject(this, style);
 }
 
 #if ENABLE(INPUT_MULTIPLE_FIELDS_UI)
 bool Element::isDateTimeEditElement() const
 {
     return false;
 }
 
@@ skipping 1964 matching lines @@
     return 0;
 }
 
 Attribute* UniqueElementData::attributeItem(unsigned index)
 {
     ASSERT_WITH_SECURITY_IMPLICATION(index < length());
     return &m_attributeVector.at(index);
 }
 
 } // namespace WebCore