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

Source/modules/encryptedmedia/MediaKeys.cpp

 /*
  * 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 100 matching lines @@
     // 4. Add the new object to an internal list of session objects.
     m_sessions.append(session);
 
     // 5. Schedule a task to generate a key request, providing type, initData, and the new object.
     session->generateKeyRequest(type, initData);
 
     // 6. Return the new object to the caller.
     return session;
 }
 
-void MediaKeys::setMediaElement(HTMLMediaElement* element)
+void MediaKeys::setMediaElement(const Handle<HTMLMediaElement>& element)
 {
-    m_mediaElement = element;
+    m_mediaElement = element.raw();
 }
 
 MediaPlayer* MediaKeys::cdmMediaPlayer(const CDM*) const
 {
     if (m_mediaElement)
         return m_mediaElement->player();
     return 0;
 }
 
 }
 
 #endif