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This is a reland of 6a3c229f

Original change's description:
> [CrOS PhoneHub] Add setter functions to various manager classes
>
> The added setters are going to be used by a future Cl that implements
> the PhoneStatusProcessor class.
>
> Bug: 1106937
> Change-Id: Ie95210cfcedbba2ad3ed5875a34ef21a7486b13f
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2423346
> Commit-Queue: Jimmy Gong <jimmyxgong@chromium.org>
> Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#810084}

Bug: 1106937
Change-Id: I0278e9221eac360ac6f6000fa1400bf83d0d6437
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2439014Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Commit-Queue: Jimmy Gong <jimmyxgong@chromium.org>
Cr-Commit-Position: refs/heads/master@{#811933}