Makes sure that upload events are still fired after GC.

On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".


PASS loadstart event fired on XMLHttpRequestUpload: [object XMLHttpRequestProgressEvent]
PASS onprogress event fired on XMLHttpRequestUpload: [object XMLHttpRequestProgressEvent] [Loaded: 4 Total: 4]
PASS load event fired on XMLHttpRequestUpload: [object XMLHttpRequestProgressEvent]
PASS successfullyParsed is true

TEST COMPLETE