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Fixes two separate issues with the unconsented primary account sign-out
flow within PrimaryAccountMutator and PrimaryAccountManager:
1. Check HasUnconsentedPrimaryAccount in PrimaryAccountMutator so that
   the PrimaryAccountManager::SignOutXYZ is actually invoked even if
   there's no sync consent.
2. Make sure PrimaryAccountMutator calls GoogleSignedOut using a correct
   account info - before this change, it would be invoked with an empty
   account info if there's no sync consent.

Bug: 1130526
Change-Id: I9019faeb602a32a499ae7fd3cab09f5634fc69ab
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2421739
Commit-Queue: Boris Sazonov <bsazonov@chromium.org>
Reviewed-by: David Roger <droger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#809317}