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MessageTransferOperation now uses the SecureChannelClient to request secure connections
to remote devices, instead of BleConnectionManager. This functionality is gated behind
the chromeos::features::kMultiDeviceApi.

This CL completely migrates Tether to the SecureChannel and DeviceSync services (besides
the feature flags gating their use, which will be removed in the next milestone).

Bug: 824568, 752273
Change-Id: I5689fd43e427a5140b6c05f5bbf659709fcb4139
Reviewed-on: https://chromium-review.googlesource.com/1105571
Commit-Queue: Ryan Hansberry <hansberry@chromium.org>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#568343}