LayoutTests/http/tests/xmlhttprequest/reentrant-cancel.html

<script>
if (window.testRunner)
    testRunner.dumpAsText();

function addElement() {
    document.documentElement.appendChild(document.createTextNode('X'));
}
document.addEventListener("DOMContentLoaded", addElement, false);
window.onload = addElement;

var xhr = new XMLHttpRequest;
function sendXHR()
{
    xhr.open("GET", "", true);
    xhr.send();
}
window.addEventListener("DOMSubtreeModified", sendXHR);
addElement();
</script>
This tests that when we re-entrantly create and cancel XHRs, we don't try to disconnect the same CachedResourceClient
multiple times from its CachedResource. We pass if we don't crash.