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This change enables BluetoothAdapterWinrt by default. In order to
continue to support chrome.bluetooth and chrome.bluetoothSockets on
Windows 10, BluetoothAdapterFactory::GetClassicAdapter() is introduced.
This method will always create a BluetoothAdapterWin on Windows, while
it is equivalent to BluetoothAdapterFactory::GetAdapter() on other
platforms.

Bug: 821766
Change-Id: Idfe8e990987de2b72e2ecaee743ad43ee6722ceb
Reviewed-on: https://chromium-review.googlesource.com/1179824
Commit-Queue: Jan Wilken Dörrie <jdoerrie@chromium.org>
Reviewed-by: Reilly Grant <reillyg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#584258}