[CrOS MultiDevice] Initialize MultiDeviceSetupService.

This CL:
(1) Initializes the SetupFlowCompletionRecorder and
    AccountStatusChangeDelegateNotifier classes when the service starts
    up. Previously, they were not actually integrated into the service.
(2) Adds a MultiDeviceSetupInitializer class which initializes the
    service by waiting until the DeviceSyncClient has loaded the local
    remote device before continuing. This task must complete before
    AccountStatusChangeDelegateNotifier is created as that class
    assumes that the client has been fully initialized.
(3) Adjusts ProfileImpl to pass various parameters to the service which
    are required for the initialization described above.

Bug: 824568
Change-Id: I09240f00d29cd44e2768e3068b3284abe16b3801
Reviewed-on: https://chromium-review.googlesource.com/1110953
Reviewed-by: Ryan Hansberry <hansberry@chromium.org>
Reviewed-by: Bernhard Bauer <bauerb@chromium.org>
Commit-Queue: Kyle Horimoto <khorimoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#569754}