We were `await`ing a synchronous method here, which will have the effect
of deferring its execution, and thus also the `event.waitUntil` call. We
want the latter to happen before control returns from the event.
Removing the unnecessary `await` solves this.
This seems unlikely to be a problem in practice, but all the same, it's
not right :)
Kevin McConnell
d7c9c4f3b0