missed XMLHttpRequest and EventSource tests

while page loading:

``` javascript
var x = new XMLHttpRequest();
x.open("GET", "some-url", true);
x.onabort = function () {
  // abort should be called!
};
x.send();

window.stop();
```

see https://developer.mozilla.org/en-US/docs/Web/API/window.stop and 
http://xhr.spec.whatwg.org/#infrastructure-for-the-send()-method
