[webrtc-stats] new commits pushed by henbos

The following commits were just pushed by henbos to https://github.com/w3c/webrtc-stats:

* Make trackIds obsolete (#570)

* Make trackIds obsolete

* Fix accidentally removing required on receiverId
  by henbos
https://github.com/w3c/webrtc-stats/commit/5d35331f9e1f1ffde4316bc20e777c97c2921ded

Received on Friday, 24 April 2020 07:22:33 UTC