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This reverts commit e6f5eba3.

Reason for revert: looks related to the Win10 Test flakiness reported by findit.

Original change's description:
> Download Shelf : Connect OfflineItem to the shelf
> 
> This CL connects offline item with the download shelf. Some of
> the OfflineItemModel methods are still not implemented.
> 
> Bug: 881499
> Change-Id: I2f0cd71815a08bcddfca753378543749389d78db
> Reviewed-on: https://chromium-review.googlesource.com/1239875
> Commit-Queue: Shakti Sahu <shaktisahu@chromium.org>
> Reviewed-by: Carlos Knippschild <carlosk@chromium.org>
> Reviewed-by: Min Qin <qinmin@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#594471}

TBR=qinmin@chromium.org,carlosk@chromium.org,shaktisahu@chromium.org

Change-Id: I98129d5eaca139d27ab7bb15f3ca194efb1331c6
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 881499, 889790
Reviewed-on: https://chromium-review.googlesource.com/1249068Reviewed-by: Marina Ciocea <marinaciocea@chromium.org>
Commit-Queue: Marina Ciocea <marinaciocea@chromium.org>
Cr-Commit-Position: refs/heads/master@{#594697}