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

Bug: 1148570
Change-Id: I10bcc9e993a9df44932719297ed1893821ae2525
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2641476
Auto-Submit: Reilly Grant <reillyg@chromium.org>
Commit-Queue: Sergey Poromov <poromov@chromium.org>
Reviewed-by: Sergey Poromov <poromov@chromium.org>
Cr-Commit-Position: refs/heads/master@{#845589}