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This CL adds methods to get all DownloadEntry from InProgressCache,
convert them, and adding them back to the DownloadDB.
This migration step allows us to move from InProgressCache to DownloadDB.

BUG=870502

Change-Id: Id56346886b1cea2df6fa25954c89cdfb4db167d4
Reviewed-on: https://chromium-review.googlesource.com/1161487
Commit-Queue: Min Qin <qinmin@chromium.org>
Reviewed-by: Xing Liu <xingliu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#580695}