Use EventHandler type instead of EventListener for event handler attributes

Source/modules/mediastream/RTCPeerConnection.idl

 /*
  * Copyright (C) 2012 Google 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
@@ skipping 51 matching lines @@
     [StrictTypeChecking, RaisesException] void removeStream(MediaStream stream);
 
     void getStats(RTCStatsCallback successCallback, [Default=Undefined] optional MediaStreamTrack selector);
 
     [RaisesException] RTCDataChannel createDataChannel([TreatNullAs=NullString, TreatUndefinedAs=NullString] DOMString label, optional Dictionary options);
 
     [RaisesException] RTCDTMFSender createDTMFSender(MediaStreamTrack track);
 
     [RaisesException] void close();
 
-    attribute EventListener onnegotiationneeded;
-    attribute EventListener onicecandidate;
-    attribute EventListener onsignalingstatechange;
-    attribute EventListener onaddstream;
-    attribute EventListener onremovestream;
-    attribute EventListener oniceconnectionstatechange;
-    attribute EventListener ondatachannel;
+    attribute EventHandler onnegotiationneeded;
+    attribute EventHandler onicecandidate;
+    attribute EventHandler onsignalingstatechange;
+    attribute EventHandler onaddstream;
+    attribute EventHandler onremovestream;
+    attribute EventHandler oniceconnectionstatechange;
+    attribute EventHandler ondatachannel;
 };