[RTCRtpSender-replaceTrack.https.html]
  bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1526207
  expected:
    if (os == "android") and release_or_beta: OK
    if os == "android": [TIMEOUT, OK]
  [ReplaceTrack transmits the new track not the old track]
    bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1526207
    expected:
      if (os == "android") and release_or_beta: PASS
      if os == "android": [TIMEOUT, PASS]
  [ReplaceTrack null -> new track transmits the new track]
    bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1526207
    expected:
      if (os == "android") and release_or_beta: PASS
      if os == "android": [NOTRUN, PASS]