GitLab

Migrate signin_error_notifier to the new method so it doesn't use
HasDummyGaiaTokenSync.

Bug: 1135980
Change-Id: I76bdd810bcfdb5952868469b23898b1b10644e99
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2454081
Commit-Queue: Anastasiia N <anastasiian@chromium.org>
Reviewed-by: Kush Sinha <sinhak@chromium.org>
Cr-Commit-Position: refs/heads/master@{#817054}