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Due to the sign-in architecture migration that extracts sign-in logic
into the mediator it is now possible to test this logic of the code.

Bug: 971989
Change-Id: I9a8279007bc219d3a7415a7b404c981073f9024d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2098383
Commit-Queue: Nohemi Fernandez <fernandex@chromium.org>
Reviewed-by: Sylvain Defresne <sdefresne@chromium.org>
Reviewed-by: Jérôme Lebel <jlebel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#752799}