Firebase storage uploadTask snapshots not progressing #4158
Description
It appears there's a bug with the way the new Compat delegates are setup in storage, a good reproduction is to cancel an upload and then check the snapshot state.
task.snapshot.state still equals running, whereas task._delegate.snapshot.state appropriately reads canceled.
You can see this on success too. I noticed this while debugging AngularFire/RxFire issues that users were reporting, while I worked around this by using the promise for now developers won't be able to takeWhile(snap => snap.state === 'running') etc. to catch errors, leading to broken observables and general mayhem in their apps.
Attached some screenshots of states seen in my console.logs. Note the conflict between the _delegate and the compat states.
