Handle XMLHttpRequest timeout

[rbelouin]

The XMLHttpRequest timeout attribute does not seem to be handled in PhantomJS, I currently have to write a setTimeout(function() { xhr.abort(); }, interval) in order to make my tests pass.

https://developer.mozilla.org/en-US/docs/Web/API/XMLHttpRequest#timeout
http://www.w3.org/TR/XMLHttpRequest/#the-timeout-attribute

[vvo]

👍

[stale]

Due to our very limited maintenance capacity, we need to prioritize our development focus on other tasks. Therefore, this issue will be automatically closed (see #15395 for more details). In the future, if we see the need to attend to this issue again, then it will be reopened. Thank you for your contribution!