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This change implements BluetoothDevice::IsPaired() by querying the
underlying device information. Furthermore, a test is added, which is
currently only enabled for Windows.

Bug: 821766
Change-Id: Idaed73fe544f115c1a0fc2157f477b009f4c26a6
Reviewed-on: https://chromium-review.googlesource.com/1172971Reviewed-by: Reilly Grant <reillyg@chromium.org>
Reviewed-by: Giovanni Ortuño Urquidi <ortuno@chromium.org>
Commit-Queue: Jan Wilken Dörrie <jdoerrie@chromium.org>
Cr-Commit-Position: refs/heads/master@{#582853}