Split BluetoothDevice into BluetoothDevice and BluetoothAdapter.
BluetoothAdapter: Represents the local BT adapter. Operations on the local
adapter (start a scan, etc).
BluetoothDevice: Represents a remote BT device. Operations on remote devices
(pair, connect, etc).
In the BroadcastReceiver, pickup the new bluetooth status from the intent instead
of calling back to LocalBluetoothManager. There could be race condition since
LocalBluetoothManager itself gets the same info via the BroadcastReceiver mechanism.
Also cleaned up logs.
Home, go back to Wireless Settings. This only happens in emulator. Bluetooth
isn't supported in emulator but the crash was fixed so users can
enable/disable Airplane Mode.
BUG=1741119
Automated import of CL 143480
