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When the host receives a deletion notification from directory, it tries
to send an invalid host ID offline reason to directory before shutting
itself down. This is likely to fail since the backend might have already
unregistered the robot account. Then the host will keep trying to send
the offline reason a few times until it eventually gives up.

Sending offline reason for host deleted on the directory is unnecessary
and will delay the host shutdown process, so this CL prevents the host
from sending the offline reason in this case.

Bug: 968859
Change-Id: I2de39b5426f52c3e3db05af92e00ec68a4dd9206
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1678700
Commit-Queue: Joe Downing <joedow@chromium.org>
Reviewed-by: Joe Downing <joedow@chromium.org>
Cr-Commit-Position: refs/heads/master@{#672758}