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This change implements skeletons required for WinRT's pairing logic. No
actual functionality is added, this will be provided in a later CL.
Furthermore, it moves the TestPairingDelegate class from BlueZ's tests
into a standalone file. It also wraps the TestPairingDelegate in
bluetooth_adapter_unittest.cc in an anonymous namespace to avoid ODR
violations.

Bug: 821766
Change-Id: If440153dff46476223a1b24dfab1a630fb2451a3
Reviewed-on: https://chromium-review.googlesource.com/1177715Reviewed-by: Reilly Grant <reillyg@chromium.org>
Commit-Queue: Jan Wilken Dörrie <jdoerrie@chromium.org>
Cr-Commit-Position: refs/heads/master@{#583989}