Move mediastream module to oilpan transition types

Source/modules/mediastream/RTCDTMFSender.idl

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
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 [
+    WillBeGarbageCollected,
     NoInterfaceObject,
     ActiveDOMObject
 ] interface RTCDTMFSender : EventTarget {
     readonly attribute boolean canInsertDTMF;
     readonly attribute MediaStreamTrack track;
     readonly attribute DOMString toneBuffer;
     readonly attribute long duration;
     readonly attribute long interToneGap;
 
     [RaisesException] void insertDTMF(DOMString tones, optional long duration, optional long interToneGap);
 
     attribute EventHandler ontonechange;
 };