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During SAML flow, we might get extra information about when the
password expires from the SAML IdP, which we store so we can then
warn the user when their password expires.

However, this information is no longer relevant - and will never
be updated by the SAML IdP - if the user no longer uses SAML to log
in. In that, case, we should simply delete it.

We should also delete it if the feature that uses it is turned off -
if an admin decides this feature is not useful to them and turns it
off, then we should clear the data. Later if they decide to try and
out the feature again, they shouldn't need to worry about data
reappearing that has been stored since last time they had the
feature enabled - that data could be very stale since it will not
have been kept up to date. Stale data can lead to spurious
password-expiry notifications.

Bug: 930109
Change-Id: Ia2f6abba306adea8b64a5f756579826ded8ffc16
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1866750Reviewed-by: Roman Sorokin [CET] <rsorokin@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Commit-Queue: A Olsen <olsen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#709838}