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When download offline content provider is enabled, we send redundant
FAILED updates. However the notification layer removes it from the shared
preferences the first time it sees a FAILED download. Hence it will
result in two different notifications. The solution is to treat COMPLETED
and FAILED as terminal downloads and filter out duplicate updates for them.

Bug: 1003550
Change-Id: Ief7c4450d644259352d3626e4f9dbd7b15362091
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1801228
Commit-Queue: Shakti Sahu <shaktisahu@chromium.org>
Reviewed-by: Min Qin <qinmin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#696989}