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Now that we're passing BackgroundFetchRegistration with
all BackgroundFetch Events, the unit tests can be simplified.

Bug: 876691, 869918
Change-Id: I5137981b32666901cdc6f953b744372695b11d72
Reviewed-on: https://chromium-review.googlesource.com/1186722
Commit-Queue: Mugdha Lakhani <nator@chromium.org>
Reviewed-by: Rayan Kanso <rayankans@chromium.org>
Reviewed-by: Peter Beverloo <peter@chromium.org>
Cr-Commit-Position: refs/heads/master@{#585861}