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These new classes are recorded by cicerone, but they still need to be
recorded in enums.xml to give them names. Also update the enum in
crostini_stability_monitor.h to keep things in sync.

Bug: 977201
Change-Id: Ia7d1349fdaf8f2790f9896933d45dbc3ef5918be
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2272620Reviewed-by: Nicholas Verne <nverne@chromium.org>
Commit-Queue: Fergus Dall <sidereal@google.com>
Cr-Commit-Position: refs/heads/master@{#783893}