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BLE advertisement logic like generating an advertisement and inspecting it
are factored into BleServiceDataHelper, allowing BleScanner and BleAdvertiser
to be agnostic of whether the new DeviceSync Mojo API is being used. This CL
completes Magic Tether's integration with the DeviceSync Mojo API; a user
can enable use of the API by enabling the kMultiDeviceApi flag.

This CL refactors BleAdvertisementGenerator and BackgroundEidGenerator to
accept RemoteDeviceRef lists with BeaconSeeds inside them, instead of
accepting a RemoteBeaconSeedFetcher. This removes the need for RemoteBeaconSeedFetcher;
it will be removed in a subsequent CL.

Bug: 824568, 752273
Change-Id: Ibfc8328ae979e176f438aa53b8258839133068b8
Reviewed-on: https://chromium-review.googlesource.com/1088311
Commit-Queue: Ryan Hansberry <hansberry@chromium.org>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#565057}