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On Android, we clean up non-resumable interrupted file from the history and
download db. However, the actual files may still be on disk.
This CL removes those files while cleaning up the database.

BUG=899775

Change-Id: I59bdf32c11789448295126b2819d326fedcf54ff
Reviewed-on: https://chromium-review.googlesource.com/c/1310499
Commit-Queue: Min Qin <qinmin@chromium.org>
Reviewed-by: Xing Liu <xingliu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#605047}