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Currently we just leave linux package operation notifications hanging
around uncompleted if the vm is shutdown before the operation
finished. Change this to have them switch to the error state on VM
shutdown. We don't try to detect shutdowns that don't go though the UI.

Bug: 966334
Change-Id: Ibdfba27291cd3f4aa3780b5b10a549dd4ea91b17
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1659556Reviewed-by: Nicholas Verne <nverne@chromium.org>
Commit-Queue: Fergus Dall <sidereal@google.com>
Cr-Commit-Position: refs/heads/master@{#669137}