GitLab

Adds code to rollback MobileIdentityConsistency: when the feature is
disabled, SigninManager will trigger a signout if there's only primary
account, but no sync consent.

Bug: 1132290
Change-Id: Ia9f0143b908c1867743e0b89b7589ddbb03bff02
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2434330
Commit-Queue: Boris Sazonov <bsazonov@chromium.org>
Reviewed-by: Mihai Sardarescu <msarda@chromium.org>
Cr-Commit-Position: refs/heads/master@{#811883}