[oilpan] Figure out lifetime of remaining Node raw pointers (Part 2)

Source/modules/encryptedmedia/MediaKeys.h

 /*
  * Copyright (C) 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 35 matching lines @@
 class MediaKeys : public RefCounted<MediaKeys>, public CDMClient {
 public:
     static PassRefPtr<MediaKeys> create(const String& keySystem, ExceptionCode&);
     ~MediaKeys();
 
     PassRefPtr<MediaKeySession> createSession(ScriptExecutionContext*, const String& mimeType, Uint8Array* initData, ExceptionCode&);
 
     const String& keySystem() const { return m_keySystem; }
     CDM* cdm() { return m_cdm.get(); }
 
-    HTMLMediaElement* mediaElement() const { return m_mediaElement; }
-    void setMediaElement(HTMLMediaElement*);
+    Result<HTMLMediaElement> mediaElement() const { return adoptRawResult(m_mediaElement); }
+    void setMediaElement(const Handle<HTMLMediaElement>&);
 
 protected:
     // CDMClient:
     virtual MediaPlayer* cdmMediaPlayer(const CDM*) const OVERRIDE;
 
     MediaKeys(const String& keySystem, PassOwnPtr<CDM>);
 
     Vector<RefPtr<MediaKeySession> > m_sessions;
 
+    // FIXME(oilpan): This is a strong pointer.
+    // MediaKeys and HTMLMediaElement should die together.
     HTMLMediaElement* m_mediaElement;
     String m_keySystem;
     OwnPtr<CDM> m_cdm;
 };
 
 }
 
 #endif // ENABLE(ENCRYPTED_MEDIA_V2)
 
 #endif // MediaKeys_h