Intermittent failure in /html/browsers/windows/embedded-opener-remove-frame.html

[jdm]

{
    "status": "FAIL", 
    "group": "default", 
    "message": "assert_equals: opener before removal expected object \"[object Window]\" but got null", 
    "stack": "testOpener@http://web-platform.test:8000/html/browsers/windows/embedded-opener-remove-frame.html:9:3\nframe.onload<@http://web-platform.test:8000/html/browsers/windows/embedded-opener-remove-frame.html:55:5\nTest.prototype.step@http://web-platform.test:8000/resources/testharness.js:1611:25\nTest.prototype.step_func/<@http://web-platform.test:8000/resources/testharness.js:1635:35\n", 
    "subtest": "opener of discarded nested browsing context", 
    "test": "/html/browsers/windows/embedded-opener-remove-frame.html", 
    "line": 89873, 
    "action": "test_result", 
    "expected": "PASS"
}
{
    "status": "TIMEOUT", 
    "group": "default", 
    "message": "Test timed out", 
    "stack": null, 
    "subtest": "opener of discarded auxiliary browsing context", 
    "test": "/html/browsers/windows/embedded-opener-remove-frame.html", 
    "line": 89874, 
    "action": "test_result", 
    "expected": "PASS"
}
{
    "status": "TIMEOUT", 
    "group": "default", 
    "message": null, 
    "stack": null, 
    "subtest": null, 
    "test": "/html/browsers/windows/embedded-opener-remove-frame.html", 
    "line": 89875, 
    "action": "test_result", 
    "expected": "CRASH"
}