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This class enables the PhoneHub Multidevice feature state when the
HostStatus (provided by the MultideviceSetupClient) of the phone is
initially |kHostSetLocallyButWaitingForBackendConfirmation|, and becomes
either 1) |kHostVerified|, or 2) becomes |kHostSetButNotYetVerified|
first, and then later |kHostVerified|. This class also disables the
PhoneHubNotification Multidevice feature state when Notification
access has been revoked by the phone, provided via
NotificationAccessManager.

Bug: 1106938
Change-Id: I01435323b3a3b8ec886ab32de0ba324b9473d2a4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2468265
Commit-Queue: Regan Hsu <hsuregan@chromium.org>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#817313}