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Currently to determine whether a download was paused by user, we look at
DownloadJob. This doesn't take into account whether the download has
been restarted. This CL consults with the in-progress DB to
determine this correctly.

Change-Id: I00212fd995f2810ddbb68f97d5b8d1594bc2cd69
Bug: 909014
Reviewed-on: https://chromium-review.googlesource.com/c/1352615Reviewed-by: Min Qin <qinmin@chromium.org>
Commit-Queue: Shakti Sahu <shaktisahu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#612940}