Intermittent failure in /fetch/security/embedded-credentials.tentative.sub.html

[jdm]

{
    "status": "FAIL", 
    "group": "default", 
    "message": "assert_equals: The image should not load. expected \"Error\" but got \"Load\"", 
    "stack": "c.port1.onmessage<@http://web-platform.test:8000/fetch/security/embedded-credentials.tentative.sub.html:36:11\nTest.prototype.step@http://web-platform.test:8000/resources/testharness.js:1908:25\nTest.prototype.step_func_done/<@http://web-platform.test:8000/resources/testharness.js:1948:32\n", 
    "subtest": "Embedded credentials are treated as network errors in new windows.", 
    "test": "/fetch/security/embedded-credentials.tentative.sub.html", 
    "line": 197608, 
    "action": "test_result", 
    "expected": "TIMEOUT"
}
{
    "status": "TIMEOUT", 
    "group": "default", 
    "message": "Test timed out", 
    "stack": null, 
    "subtest": "Embedded credentials matching the top-level are treated as network errors for cross-origin URLs.", 
    "test": "/fetch/security/embedded-credentials.tentative.sub.html", 
    "line": 197611, 
    "action": "test_result", 
    "expected": "FAIL"
}

[gterzian]

Removing label because it looks like this would be fixed by #25771

[jdm]

It would be better to add a "Fixes #24488" and leave the label until then.

[jdm]

1 unexpected results that are NOT known-intermittents:
  ▶ Unexpected subtest result in /fetch/security/embedded-credentials.tentative.sub.html:
  │ FAIL [expected TIMEOUT] Embedded credentials are treated as network errors in frames.
  │   → assert_equals: The image should not load. expected "Error" but got "Load"
  │ 
  │ i.onload</c.port1.onmessage<@http://web-platform.test:8000/fetch/security/embedded-credentials.tentative.sub.html:19:11
  │ Test.prototype.step@http://web-platform.test:8000/resources/testharness.js:1867:25
  └ Test.prototype.step_func_done/<@http://web-platform.test:8000/resources/testharness.js:1908:32