Replace RenderArena with PartitionAlloc.

Source/core/html/HTMLMediaElement.h

 /*
  * Copyright (C) 2007, 2008, 2009, 2010, 2011, 2012, 2013 Apple Inc. 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.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 318 matching lines @@
 private:
     void createMediaPlayer();
 
     virtual bool alwaysCreateUserAgentShadowRoot() const OVERRIDE { return true; }
     virtual bool areAuthorShadowsAllowed() const OVERRIDE { return false; }
 
     virtual bool hasCustomFocusLogic() const OVERRIDE;
     virtual bool supportsFocus() const;
     virtual bool isMouseFocusable() const;
     virtual bool rendererIsNeeded(const NodeRenderingContext&);
-    virtual RenderObject* createRenderer(RenderArena*, RenderStyle*);
+    virtual RenderObject* createRenderer(RenderStyle*);
     virtual bool childShouldCreateRenderer(const NodeRenderingContext&) const OVERRIDE;
     virtual InsertionNotificationRequest insertedInto(ContainerNode*) OVERRIDE;
     virtual void removedFrom(ContainerNode*) OVERRIDE;
     virtual void didRecalcStyle(StyleChange);
     
     virtual void didBecomeFullscreenElement();
     virtual void willStopBeingFullscreenElement();
 
     // ActiveDOMObject functions.
     virtual bool canSuspend() const;
@@ skipping 253 matching lines @@
 
 inline HTMLMediaElement* toMediaElement(Node* node)
 {
     ASSERT_WITH_SECURITY_IMPLICATION(!node || isMediaElement(node));
     return static_cast<HTMLMediaElement*>(node);
 }
 
 } //namespace
 
 #endif