[w3c/ServiceWorker] Service Worker makes AJAX Progress Listener not Working (#1141)

Hi everyone,

With Service Worker (SW) installed on a web apps, it caused "AJAX Progress Listener" not working.
Any idea?
Thanks in advance

The Service Worker
```
if ('serviceWorker' in navigator && (window.location.protocol === 'https:')) {
        navigator.serviceWorker.register('/service-worker.js')
        .then(function(registration) {
          //Checks the server for an updated version of the service worker without consulting caches.
          //registration.update();
          
          // updatefound is fired if service-worker.js changes.
          registration.onupdatefound = function() {
            // updatefound is also fired the very first time the SW is installed,
            // and there's no need to prompt for a reload at that point.
            // So check here to see if the page is already controlled,
            // i.e. whether there's an existing service worker.
            if (navigator.serviceWorker.controller) {
              // The updatefound event implies that registration.installing is set:
              // https://slightlyoff.github.io/ServiceWorker/spec/service_worker/index.html#service-worker-container-updatefound-event
              var installingWorker = registration.installing;

              installingWorker.onstatechange = function() {
                switch (installingWorker.state) {
                  case 'installed':
                    // At this point, the old content will have been purged and the
                    // fresh content will have been added to the cache.
                    // It's the perfect time to display a "New content is
                    // available; please refresh." message in the page's interface.
                    console.warn('New content is available, please refresh the page');
                    break;

                  case 'redundant':
                    throw new Error('The installing ' +
                                    'service worker became redundant.');

                  default:
                    // Ignore
                }
              };
            }
          };
        }).catch(function(e) {
          console.error('Error during service worker registration:', e);
        });
      }
```

And, the Ajax Uploader
```
function uploadPic(){
        var file = document.getElementById('fileInput').files[0];
        var fd = new FormData();
        fd.append("file", file);

        var xhr = new XMLHttpRequest();

        //attach listener before posting
        xhr.upload.onprogress = updateProgressBar;

        xhr.onreadystatechange = function() {//Call a function when the state changes.
            if(xhr.readyState == 4 && xhr.status == 200) {
                console.log(xhr.responseText);
            }
        }

        xhr.open("POST", "https://www.mysite.com/upload.php", true);
        xhr.send(fd);
      }

      function updateProgressBar(e){
        if (e.lengthComputable) {
          var percentComplete = (e.loaded / e.total) * 100;
          console.log(percentComplete + '% uploaded', e);
        }
      }
```

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https://github.com/w3c/ServiceWorker/issues/1141