Bug 1088527 - Modify BluetoothOppManager.IsConnected to indicate whether profile is connected or not. r=btian
BluetoothOppManager.IsConnected() couldn't represent the connection status
of Opp profile since it only return true if there is an ongoing
file-transfer session.

This function was used to named |IsTransferring()| in Bug 827267, however,
it was renamed to |IsConnected()| when Bug 842948 landed.