Bug 1506085 [wpt PR 14001] - Update interfaces/webrtc.idl, a=testonly

Automatic update from web-platform-testsUpdate interfaces/webrtc.idl (#14001)

Source: https://github.com/tidoust/reffy-reports/blob/83bbd56/whatwg/idl/webrtc.idl
Build: https://travis-ci.org/tidoust/reffy-reports/builds/452744285
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wpt-commits: c506a34947682ca230cc526d7a57cb9a40a917f0
wpt-pr: 14001

testing/web-platform/tests/interfaces/webrtc.idl

@@ -402,7 +402,7 @@ dictionary RTCRtpSynchronizationSource : RTCRtpContributingSource {
 };
 
 [Exposed=Window] interface RTCDtlsTransport : EventTarget {
-    readonly        attribute RTCIceTransport transport;
+    readonly        attribute RTCIceTransport iceTransport;
     readonly        attribute RTCDtlsTransportState state;
     sequence<ArrayBuffer> getRemoteCertificates();
                     attribute EventHandler onstatechange;