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Currently, the only identifier for showing Bluetooth authenticators on
WebAuthN UI modals is the authenticator ID which represents the MAC id
of the device. As this is not user friendly, add human-readable
authenticator_display_name to AuthenticatorReference.

Bug: 877344
Change-Id: I2d3b35db669d8f8f61e9989870122a211d80e80f
Reviewed-on: https://chromium-review.googlesource.com/1247681
Commit-Queue: Jun Choi <hongjunchoi@chromium.org>
Reviewed-by: Balazs Engedy <engedy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#595626}