See  issue 807212  for details.
It timeouts occasionally.

Log

06:10:45.647 9793 worker/2 virtual/service-worker-script-streaming/external/wpt/service-workers/service-worker/fetch-event.https.html output stderr lines:
06:10:45.647 9793   CONSOLE ERROR: Error parsing 'integrity' attribute ('gs0nqru8KbsrIt5YToQqS9fYao4GQJXtcId610g7cCU='). The hash algorithm must be one of 'sha256', 'sha384', or 'sha512', followed by a '-' character.
06:10:45.647 9793   CONSOLE ERROR: line 200: Uncaught NotFoundError: Failed to execute 'removeChild' on 'Node': The node to be removed is not a child of this node.
06:10:45.649 9640 [1907/10692] virtual/service-worker-script-streaming/external/wpt/service-workers/service-worker/fetch-event.https.html failed unexpectedly (test timed out)
06:10:45.648 9793 worker/2 killing primary driver
06:10:45.648 9793 worker/2 killing secondary driver
06:10:45.648 9793 worker/2 virtual/service-worker-script-streaming/external/wpt/service-workers/service-worker/fetch-event.https.html failed:
06:10:45.648 9793 worker/2  test timed out