LayoutTests/http/tests/xmlhttprequest/auth-reject-protection-space.html

<script>
if (window.testRunner) {
    testRunner.dumpAsText();
    testRunner.waitUntilDone();
    testRunner.setRejectsProtectionSpaceAndContinueForAuthenticationChallenges(true);
}
var request = new XMLHttpRequest;
request.onreadystatechange = function () {
    if (request.readyState === 4) {
        alert("status: " + request.status);
        if (window.testRunner);
            testRunner.notifyDone();
    }
};
request.open('GET', 'resources/basic-auth/basic-auth.py');
request.send(null);
</script>