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This CL changes CrostiniManager to not try to install/restart crostini
while it is being uninstalled, and to abort any running restarts if
the uninstall process starts. It does not update the UI to prevent the
user from trying to do both operations at the same time.

Bug: 919153, 928339
Change-Id: Iccb829228e902c24a1ce653c1c244ad789bebe41
Reviewed-on: https://chromium-review.googlesource.com/c/1453956
Commit-Queue: Fergus Dall <sidereal@google.com>
Reviewed-by: Nicholas Verne <nverne@chromium.org>
Cr-Commit-Position: refs/heads/master@{#629479}