Replace RenderArena with PartitionAlloc.

Source/core/html/HTMLButtonElement.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2010 Apple 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 27 matching lines @@
 
     virtual bool willRespondToMouseClickEvents() OVERRIDE;
 
 private:
     HTMLButtonElement(const QualifiedName& tagName, Document*, HTMLFormElement*);
 
     enum Type { SUBMIT, RESET, BUTTON };
 
     virtual const AtomicString& formControlType() const;
 
-    virtual RenderObject* createRenderer(RenderArena*, RenderStyle*);
+    virtual RenderObject* createRenderer(RenderStyle*);
 
     // HTMLFormControlElement always creates one, but buttons don't need it.
     virtual bool alwaysCreateUserAgentShadowRoot() const OVERRIDE { return false; }
 
     virtual void parseAttribute(const QualifiedName&, const AtomicString&) OVERRIDE;
     virtual bool isPresentationAttribute(const QualifiedName&) const OVERRIDE;
     virtual void defaultEventHandler(Event*);
 
     virtual bool appendFormData(FormDataList&, bool);
 
@@ skipping 12 matching lines @@
     virtual bool isOptionalFormControl() const { return true; }
     virtual bool recalcWillValidate() const;
 
     Type m_type;
     bool m_isActivatedSubmit;
 };
 
 } // namespace
 
 #endif