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The "force signin" policy is updated to handle ephemeral Guest profiles
similar to off the record Guest profiles.

Please see go/ephemeral-guest-profiles for more context.

Bug: 1125474
Change-Id: I5527423c3fbc9abe3ac005242b11203d25121066
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2577682
Commit-Queue: Ramin Halavati <rhalavati@chromium.org>
Reviewed-by: David Roger <droger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#834662}