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In certain cases, Gaia's /ListAccounts APIs claims accounts to be in a
valid state when they are actually invalid. This causes issues with
account reconciliation because |AccountReconcilor| uses /ListAccounts as
the source of truth and is unable to detect this state.
In this state, certain Google properties like Gmail for example send a
Mirror re-authentication header for the offending account. However, even
after the user re-authenticates the account, account reconciliation ends
up being a no-op because the reconcilor thinks that the user's cookies
are valid and there is nothing to reconcile.

Fix this by storing some flags in |CookieReminter| which are set when
we receive Mirror re-authentication headers from Gaia, and are cleared
when the next reconciliation cycle begins.

This is a temporary fix until we can submit https://crrev.com/c/1871591.

Bug: 1012649
Change-Id: I04fd971cdc788094f038ee808b4a38003ef48e22
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1883652Reviewed-by: David Roger <droger@chromium.org>
Commit-Queue: Anastasiia Nikolaienko <anastasiian@chromium.org>
Cr-Commit-Position: refs/heads/master@{#710870}