@Override
  public void unregisterListener(HardwareDeviceListener deviceListener) {
    if (deviceListeners.contains(deviceListener)) {
      deviceListeners.remove(deviceListener);
    }
  }
Shutdown the AndroidDebugBridge and clean up all connected devices.
selendroid-standalone/src/main/java/io/selendroid/standalone/android/impl/DefaultDeviceManager.java