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Adds a notification triggered by a signal from the Kerberos credentials
manager when the active Kerberos ticket expires. Upon clicking the
ticket, the reauthentication flow is started. In practice, this should
happen every few weeks if the Kerberos ticket lifetime and renewal
lifetime are set properly on the KDC, e.g. 24 h lifetime + 14 days
renewal lifetime.

BUG=chromium:952245
TEST=None

Change-Id: I0bb9965a0598571208f20c9ab53750ded2f6769a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1667304Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Reviewed-by: Michael Giuffrida <michaelpg@chromium.org>
Reviewed-by: Ryo Hashimoto <hashimoto@chromium.org>
Commit-Queue: Lutz Justen <ljusten@chromium.org>
Auto-Submit: Lutz Justen <ljusten@chromium.org>
Cr-Commit-Position: refs/heads/master@{#673353}