Bug 1632819 [wpt PR 23228] - Update interfaces/webrtc-stats.idl, a=testonly

Automatic update from web-platform-tests
Update interfaces/webrtc-stats.idl (#23228)

Source: https://github.com/tidoust/reffy-reports/blob/eeef44a/ed/idl/webrtc-stats.idl
Build: https://travis-ci.org/tidoust/reffy-reports/builds/679007987
--

wpt-commits: c430c87d74939e9a10fbf00782fa49669ec0bd5b
wpt-pr: 23228

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

@@ -70,7 +70,6 @@ dictionary RTCReceivedRtpStreamStats : RTCRtpStreamStats {
 };
 
 dictionary RTCInboundRtpStreamStats : RTCReceivedRtpStreamStats {
- required DOMString   trackId;
  required DOMString   receiverId;
  DOMString            remoteId;
  unsigned long        framesDecoded;
@@ -131,7 +130,6 @@ dictionary RTCSentRtpStreamStats : RTCRtpStreamStats {
 
 dictionary RTCOutboundRtpStreamStats : RTCSentRtpStreamStats {
              unsigned long        rtxSsrc;
-             DOMString            trackId;
              DOMString            mediaSourceId;
              DOMString            senderId;
              DOMString            remoteId;