Update MediaKeySession method names to latest EME spec.

Source/modules/encryptedmedia/MediaKeySession.idl

 /*
  * 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 17 matching lines @@
 ] interface MediaKeySession : EventTarget {
     // error state
     readonly attribute MediaKeyError error;
 
     // session properties
     readonly attribute DOMString keySystem;
     readonly attribute DOMString sessionId;
 
     // session operations
     [RaisesException] void update(Uint8Array key);
-    void close();
+    void release();

[ddorwin, 2014/01/09 01:35:31]

[RaisesException] - It can throw in the spec.

[xhwang, 2014/01/09 02:32:17]

Done.

 
     // EventHandlers
     [RuntimeEnabled=EncryptedMedia] attribute EventHandler onwebkitkeyadded;
     [RuntimeEnabled=EncryptedMedia] attribute EventHandler onwebkitkeyerror;
     [RuntimeEnabled=EncryptedMedia] attribute EventHandler onwebkitkeymessage;
 };