Intermittent fail in /html/semantics/embedded-content/media-elements/event_timeupdate_noautoplay.html

[jdm]

{
    "status": "FAIL", 
    "group": "default", 
    "message": "assert_unreached: Reached unreachable code", 
    "stack": null, 
    "subtest": "calling play() on a sufficiently long audio should trigger timeupdate event", 
    "test": "/html/semantics/embedded-content/media-elements/event_timeupdate_noautoplay.html", 
    "line": 74793, 
    "action": "test_result", 
    "expected": "PASS"
}