DO NOT MERGE. Update notifications when deleting downloads.

Otherwise we end up leaving stale notifications around after the
underlying download was deleted.

Change-Id: Ie262a9dd369034de6c06be28b0eedc4231ea2e75
Test: none
Bug: 30697605
(cherry picked from commit 3b7e099588a2697305fd52c342f404a03ec9a9ab)
1 file changed