Intermittent failure in /css/cssom-view/MediaQueryList-addListener-handleEvent.html

[jdm]

{
    "status": "PASS", 
    "group": "default", 
    "message": null, 
    "stack": null, 
    "subtest": "looks up handleEvent method on every event dispatch", 
    "test": "/css/cssom-view/MediaQueryList-addListener-handleEvent.html", 
    "line": 151512, 
    "action": "test_result", 
    "expected": "FAIL"
}
{
    "status": "PASS", 
    "group": "default", 
    "message": null, 
    "stack": null, 
    "subtest": "doesn't look up handleEvent method on callable event listeners", 
    "test": "/css/cssom-view/MediaQueryList-addListener-handleEvent.html", 
    "line": 151513, 
    "action": "test_result", 
    "expected": "FAIL"
}