Oilpan: make MediaError + TrackEvent heap savvier.

Source/core/html/MediaError.h

 /*
  * Copyright (C) 2007 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 14 matching lines @@
 
 #ifndef MediaError_h
 #define MediaError_h
 
 #include "bindings/v8/ScriptWrappable.h"
 #include "wtf/PassRefPtr.h"
 #include "wtf/RefCounted.h"
 
 namespace WebCore {
 
-class MediaError : public RefCounted<MediaError>, public ScriptWrappable {
+class MediaError FINAL : public RefCountedWillBeGarbageCollectedFinalized<MediaError>, public ScriptWrappable {
 public:
     enum Code {
         MEDIA_ERR_ABORTED = 1,
         MEDIA_ERR_NETWORK,
         MEDIA_ERR_DECODE,
         MEDIA_ERR_SRC_NOT_SUPPORTED,
         MEDIA_ERR_ENCRYPTED
     };
 
-    static PassRefPtr<MediaError> create(Code code) { return adoptRef(new MediaError(code)); }
+    static PassRefPtrWillBeRawPtr<MediaError> create(Code code)
+    {
+        return adoptRefWillBeNoop(new MediaError(code));
+    }
 
     Code code() const { return m_code; }
 
+    void trace(Visitor*) { }
+
 private:
     MediaError(Code code) : m_code(code)
     {
         ScriptWrappable::init(this);
     }
 
     Code m_code;
 };
 
 } // namespace WebCore
 
 #endif