GitLab

This CL is a follow up of [1], where production code was migrated away
from using SigninManager APIs directly, in favor of IdentityManager
(//services/identity). This is done as part of the servicification effort.

After this CL, the last remaining step will be converting DiceResponseHandler
(production code) away from using ProfileOAuth2TokenService directly,
blocked of crbug.com/887870.

[1] https://crrev.com/c/1318550

BUG=890790

Change-Id: Ifc54410bd7112c1e2fae01d6770ab6afa002481d
Reviewed-on: https://chromium-review.googlesource.com/c/1316927
Commit-Queue: Antonio Gomes <tonikitoo@igalia.com>
Reviewed-by: David Roger <droger@chromium.org>
Reviewed-by: Colin Blundell <blundell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#608684}