NotificationManagerService: minor cleanup

import android.hardware.Usb;

import android.media.AudioManager;

import android.net.Uri;

import android.os.BatteryManager;

import android.os.Bundle;

import android.os.Binder;

import android.os.Handler;

import android.view.accessibility.AccessibilityEvent;

import android.view.accessibility.AccessibilityManager;

import android.widget.Toast;

import android.widget.Toast;

import java.io.FileDescriptor;

import java.io.PrintWriter;

    private WorkerHandler mHandler;

    private StatusBarManagerService mStatusBar;

    private LightsService mLightsService;

    private LightsService.Light mNotificationLight;

    private LightsService.Light mAttentionLight;

            mDisabledNotifications = StatusBarManager.DISABLE_NOTIFICATION_ALERTS;

        }

        // register for battery changed notifications

        // register for various Intents

        IntentFilter filter = new IntentFilter();

        filter.addAction(Usb.ACTION_USB_STATE);

        filter.addAction(Intent.ACTION_SCREEN_ON);