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This change fixes BluetoothDeviceWinrt::DiscoonectGatt. It does so by
working around a quirk in the UWP APIs, that requires dropping all
internal references to a given device. See this GitHub issue for further
discussion: https://github.com/jasongin/noble-uwp/issues/20

Bug: 821766
Change-Id: I5bf0e4e0ce0e3b43d9cbb10e3b11e378de05e6b3
Reviewed-on: https://chromium-review.googlesource.com/1183234Reviewed-by: Giovanni Ortuño Urquidi <ortuno@chromium.org>
Reviewed-by: Reilly Grant <reillyg@chromium.org>
Commit-Queue: Jan Wilken Dörrie <jdoerrie@chromium.org>
Cr-Commit-Position: refs/heads/master@{#585799}