Replace RenderArena with PartitionAlloc.

Source/core/html/HTMLImageElement.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2004, 2008, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2010 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
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
@@ skipping 73 matching lines @@
     virtual void didMoveToNewDocument(Document* oldDocument) OVERRIDE;
 
 private:
     virtual bool areAuthorShadowsAllowed() const OVERRIDE { return false; }
 
     virtual void parseAttribute(const QualifiedName&, const AtomicString&) OVERRIDE;
     virtual bool isPresentationAttribute(const QualifiedName&) const OVERRIDE;
     virtual void collectStyleForPresentationAttribute(const QualifiedName&, const AtomicString&, MutableStylePropertySet*) OVERRIDE;
 
     virtual void attach(const AttachContext& = AttachContext()) OVERRIDE;
-    virtual RenderObject* createRenderer(RenderArena*, RenderStyle*);
+    virtual RenderObject* createRenderer(RenderStyle*);
 
     virtual bool canStartSelection() const;
 
     virtual bool isURLAttribute(const Attribute&) const OVERRIDE;
 
     virtual bool draggable() const;
 
     virtual void addSubresourceAttributeURLs(ListHashSet<KURL>&) const;
 
     virtual InsertionNotificationRequest insertedInto(ContainerNode*) OVERRIDE;
@@ skipping 14 matching lines @@
 
 inline const HTMLImageElement* toHTMLImageElement(const Node* node)
 {
     ASSERT_WITH_SECURITY_IMPLICATION(!node || node->hasTagName(HTMLNames::imgTag));
     return static_cast<const HTMLImageElement*>(node);
 }
 
 } //namespace
 
 #endif