Make default bluetooth adaptor name more robust w.r.t. CrOS device type.
Make default bluetooth adaptor name more robust w.r.t. CrOS device type.

This CL uses a new utility introduced in https://codereview.chromium.org/1204783005. It may make sense to push the device-type-to-ascii conversion up to /chromeos, since it is also done in https://codereview.chromium.org/1203263003.

Review URL: https://codereview.chromium.org/1204093003

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#338781}

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