GitLab

Also update all the callers and adapt the unit tests to stop using a custom
FakeSigninManagerBase and PO2TS, using IdentityManager and related test
utilities (e.g. IdentityTestEnvironment, PrimaryAccountMutator) instead,
so that the actual code being ported to can be tested. This means that
the STATUS_CASE_AUTHENTICATING case can't be tested anymore for ChromeOS,
but hopefully that should not be an issue since ChromeOS doesn't support
signin-in/out the primary account anyway.

Bug: 890796
Change-Id: Iadcb5440eef126a801dd6c0cd145cbbe0bfb0b6d
Reviewed-on: https://chromium-review.googlesource.com/c/1362902Reviewed-by: Toni Baržić <tbarzic@chromium.org>
Reviewed-by: Sylvain Defresne <sdefresne@chromium.org>
Reviewed-by: Marc Treib <treib@chromium.org>
Reviewed-by: Joshua Bell <jsbell@chromium.org>
Reviewed-by: Colin Blundell <blundell@chromium.org>
Reviewed-by: Mikel Astiz <mastiz@chromium.org>
Reviewed-by: Peter Kasting <pkasting@chromium.org>
Commit-Queue: Mario Sanchez Prada <mario@igalia.com>
Cr-Commit-Position: refs/heads/master@{#616094}