GitLab

Replace the usage of SigninManager API by IdentityManager's.

Bug: 905281
Change-Id: I64453935c4312eeaf1f42c770aa01d16b6238730
Reviewed-on: https://chromium-review.googlesource.com/c/1337615
Commit-Queue: Sergio Villar <svillar@igalia.com>
Reviewed-by: Sylvain Defresne <sdefresne@chromium.org>
Reviewed-by: Achuith Bhandarkar <achuith@chromium.org>
Cr-Commit-Position: refs/heads/master@{#608724}