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Integrates MultiDeviceSetupClient into TetherService.

If the chromeos::features::kEnableUnifiedMultiDeviceSetup flag is enabled,
Instant Tethering will only be displayed in Settings and Quick Settings
if a verified MultiDevice host exists.

Bug: 824568
Change-Id: Iad6b6778a2986c7c92176bc7d8f4ac47bd47f5e3
Reviewed-on: https://chromium-review.googlesource.com/1141145
Commit-Queue: Ryan Hansberry <hansberry@chromium.org>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#576750}