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This implementation is a port of tether::BleServiceDataHelperImpl, but
correctly uses its provided DevicePair arguments, and uses a
RemoteDeviceCache for device storage.

This CL also fixes a small bug in tether::BleServiceDataHelperImpl that
caused it to attempt to identify *all* known Tether hosts, instead of the
requested hosts.

Bug: 824568, 752273
Change-Id: Ib8ab47dfcb2889392b6ec5f519aed706ffc513d9
Reviewed-on: https://chromium-review.googlesource.com/1098146
Commit-Queue: Ryan Hansberry <hansberry@chromium.org>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#567121}