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Update the backgroundfetchfail & backgroundfetchabort event types to
instantiate BackgroundFetchUpdateEvent & BackgroundFetchSettledEvent
respectively.
https://wicg.github.io/background-fetch/#service-worker-global-events

Bug: 822765
Change-Id: Iea5311fdbedf805ec8d4d54daca0257078dc050d
Reviewed-on: https://chromium-review.googlesource.com/1005177Reviewed-by: Ken Buchanan <kenrb@chromium.org>
Reviewed-by: Makoto Shimazu <shimazu@chromium.org>
Reviewed-by: Peter Beverloo <peter@chromium.org>
Commit-Queue: Rayan Kanso <rayankans@chromium.org>
Cr-Commit-Position: refs/heads/master@{#558313}