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This change converts callbacks from base::Bind and base::Callback to
Once/Repeating in //chrome/browser/chromeos/lock_screen_apps.

Bug: 1148570
Change-Id: I85b8e4e83d9f61d3cdc0da02f6650418c1ccccff
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2644110
Auto-Submit: Reilly Grant <reillyg@chromium.org>
Reviewed-by: Toni Baržić <tbarzic@chromium.org>
Commit-Queue: Reilly Grant <reillyg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#846204}