Rename RTCIceCandidateEvent to RTCPeerConnectionIceEvent and expose.

third_party/WebKit/Source/modules/peerconnection/RTCPeerConnectionIceEvent.idl

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
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 [
-    NoInterfaceObject
-] interface RTCIceCandidateEvent : Event {
-    readonly attribute RTCIceCandidate candidate;
+    Constructor(DOMString type, optional RTCPeerConnectionIceEventInit eventInitDict)
+] interface RTCPeerConnectionIceEvent : Event {
+    readonly attribute RTCIceCandidate? candidate;
+    // TODO(lunalu): add nullable url attribute here:
+    // https://rawgit.com/w3c/webrtc-pc/master/webrtc.html#rtcpeerconnectioniceevent
 };