Use test UUIDs for device bluetooth unit tests

This is a follow-up CL for:
https://codereview.chromium.org/2785383002/diff/80001/device/bluetooth/bluetooth_remote_gatt_service_unittest.cc

This CL added some test characteristic and descriptor UUIDs to
bluetooth_test.h and updated device bluetooth unit tests to use them.

BUG=None

Review-Url: https://codereview.chromium.org/2798193002
Cr-Commit-Position: refs/heads/master@{#462946}
6 files changed