Re: [whatwg/xhr] The upload listener flag is not respected in browsers (#95)

Here is my test case:
```javascript
// Returns an array which contains all events fired by the xhr
function recordEvents(xhr) {
 var xhrEvents = [
  'loadstart',
  'progress',
  'abort',
  'error',
  'load',
  'timeout',
  'loadend',
 ];
 var events = [];
 var recordEvent = function(e, prefix) {
  prefix = prefix ? 'upload.' : '';
  events.push(prefix + e.type + '(' + e.loaded + ',' + e.total +
   ',' + e.lengthComputable +')');
 };
 var recordUploadEvent = function(event) {
  recordEvent(event, 'upload');
 };
 for (var i = 0; i < xhrEvents.length; i++) {
  xhr.addEventListener(xhrEvents[i], recordEvent);
  xhr.upload.addEventListener(xhrEvents[i], recordUploadEvent);
 }
 xhr.addEventListener('readystatechange', function() {
  events.push('readystatechange(' + this.readyState + ')');
 });
 return events;
}
var xhr;

// Test-case 1: effect of the upload listener flag on upload progress events
xhr = new XMLHttpRequest();
xhr.open('POST', './');
xhr.send('body!');
// listeners added AFTER send() -> upload listener flag === false
var events1 = recordEvents(xhr);

// Test-case 2: effect of the upload listener flag on upload progress events during abort()
xhr = new XMLHttpRequest();
xhr.open('POST', './');
xhr.send('body!');
// listeners added AFTER send() -> upload listener flag === false
var events2 = recordEvents(xhr);
xhr.abort();

// Wait until requests are done
setTimeout(function() {
 console.log(events1, events2);
}, 1000);
```

Results in Firefox:

    [ "upload.progress(5,5,true)", "upload.load(5,5,true)", "upload.loadend(5,5,true)", "readystatechange(2)", "readystatechange(3)", "progress(1589,1589,true)", "readystatechange(4)", "load(1589,1589,true)", "loadend(1589,1589,true)" ]
    [ "readystatechange(4)", "abort(0,0,false)", "loadend(0,0,false)", "upload.abort(0,5,true)", "upload.loadend(0,5,true)" ]

Results in Chrome:

    ["readystatechange(2)", "readystatechange(3)", "progress(1589,1589,true)", "readystatechange(4)", "load(1589,1589,true)", "loadend(1589,1589,true)"]
    ["readystatechange(4)", "upload.progress(0,0,false)", "upload.abort(0,0,false)", "upload.loadend(0,0,false)", "progress(0,0,false)", "abort(0,0,false)", "loadend(0,0,false)"]

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