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After a fetch resumes, the Job Controller needs a
BackgroundFetchRequestInfo to update and complete the download.

Change-Id: Id8f8721381049cdf057214f08fa7372b5256c095
Reviewed-on: https://chromium-review.googlesource.com/1155584
Commit-Queue: Rayan Kanso <rayankans@chromium.org>
Reviewed-by: Peter Beverloo <peter@chromium.org>
Cr-Commit-Position: refs/heads/master@{#579894}