commit 96f653f3e3ff4d2f3520c13ec7fecac6c379205d
author Xing Liu <xingliu@chromium.org> Sat Jun 24 02:55:40 2017
committer Commit Bot <commit-bot@chromium.org> Sat Jun 24 21:59:30 2017
tree 5f01129d0e5c64a7e41acf6b61808b5500ac06c2
parent 849062508c77430d85913666ad36239510a06a6d

Download service: Fixed download driver remove call crash.

DownloadDriverImpl::Remove will delete the DownloadItem object in
memory, it can't be called in any DownloadItem::Observer calls in the
same call stack. So post the actual remove call to task queue.

Bug: 736046
Change-Id: I9bfd0be40a820fe02afd4613381e13fe5857d0c5
Reviewed-on: https://chromium-review.googlesource.com/545111
Commit-Queue: Xing Liu <xingliu@chromium.org>
Reviewed-by: David Trainor <dtrainor@chromium.org>
Cr-Commit-Position: refs/heads/master@{#482162}