Migrate LoginAuthRequiredCallback to BindOnce

Bug: 714018
Change-Id: Icf71c24297709c96513db23e7f562dce298e6374
Reviewed-on: https://chromium-review.googlesource.com/1048070
Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: Mark Pilgrim <pilgrim@chromium.org>
Cr-Commit-Position: refs/heads/master@{#556617}
23 files changed