Port signin_ui_util.cc away from ListAccounts()

The CL removes the dependency on GaiaCookieManagerService

Bug: 921501
Change-Id: I948d868c437d99399050192f6efd4667cf0e12ac
Reviewed-on: https://chromium-review.googlesource.com/c/1411922
Reviewed-by: Sylvain Defresne <sdefresne@chromium.org>
Reviewed-by: David Roger <droger@chromium.org>
Commit-Queue: Henrique Ferreiro <hferreiro@igalia.com>
Cr-Commit-Position: refs/heads/master@{#623191}
1 file changed