Remove cancelled download from Android

Cancelled download cannot be interacted on Android.
Thus we can safely remove them from history.

BUG=889213

Change-Id: Ia6c85a230a60c26d5a35f0f07cd68ec32d28044f
Reviewed-on: https://chromium-review.googlesource.com/1244736
Commit-Queue: Min Qin <qinmin@chromium.org>
Reviewed-by: Ilya Sherman <isherman@chromium.org>
Reviewed-by: David Trainor <dtrainor@chromium.org>
Cr-Commit-Position: refs/heads/master@{#595220}