Replace RenderArena with PartitionAlloc.

Source/core/html/track/TextTrackCue.h

 /*
  * Copyright (C) 2011 Google Inc.  All rights reserved.
  * Copyright (C) 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
@@ skipping 46 matching lines @@
     }
 
     TextTrackCue* getCue() const;
     virtual void applyCSSProperties(const IntSize& videoSize);
 
     static const AtomicString& textTrackCueBoxShadowPseudoId();
 
 protected:
     TextTrackCueBox(Document*, TextTrackCue*);
 
-    virtual RenderObject* createRenderer(RenderArena*, RenderStyle*) OVERRIDE;
+    virtual RenderObject* createRenderer(RenderStyle*) OVERRIDE;
 
     TextTrackCue* m_cue;
 };
 
 // ----------------------------
 
 class TextTrackCue : public RefCounted<TextTrackCue>, public ScriptWrappable, public EventTarget {
 public:
     static PassRefPtr<TextTrackCue> create(ScriptExecutionContext* context, double start, double end, const String& content)
     {
@@ skipping 197 matching lines @@
 
     std::pair<float, float> m_displayPosition;
 #if ENABLE(WEBVTT_REGIONS)
     String m_regionId;
 #endif
 };
 
 } // namespace WebCore
 
 #endif