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

Bug: 1148570
Change-Id: I92338ffa90e975cf9c79e151f2c784a55ddd2556
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2645404
Commit-Queue: Reilly Grant <reillyg@chromium.org>
Commit-Queue: Sergey Poromov <poromov@chromium.org>
Reviewed-by: Sergey Poromov <poromov@chromium.org>
Auto-Submit: Reilly Grant <reillyg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#846293}