hasVibrator() should only report presence of built-in vibrator.

    }

    private boolean doVibratorExists() {

        synchronized (mInputDeviceVibrators) {

            return !mInputDeviceVibrators.isEmpty() || vibratorExists();

        }

        // For now, we choose to ignore the presence of input devices that have vibrators

        // when reporting whether the device has a vibrator.  Applications often use this

        // information to decide whether to enable certain features so they expect the

        // result of hasVibrator() to be constant.  For now, just report whether

        // the device has a built-in vibrator.

        //synchronized (mInputDeviceVibrators) {

        //    return !mInputDeviceVibrators.isEmpty() || vibratorExists();

        //}

        return vibratorExists();

    }

    private void doVibratorOn(long millis) {