Clean up unused constants.

import com.android.settingslib.fuelgauge.BatteryStatus;

import com.android.settingslib.utils.BuildCompatUtils;

import java.time.Duration;

import java.util.List;

public class Utils {

    public static final String INCOMPATIBLE_CHARGER_WARNING_DISABLED =

            "incompatible_charger_warning_disabled";

    public static final String WIRELESS_CHARGING_NOTIFICATION_TIMESTAMP =

            "wireless_charging_notification_timestamp";

    @VisibleForTesting

    static final String STORAGE_MANAGER_ENABLED_PROPERTY = "ro.storage_manager.enabled";

    @VisibleForTesting static final long WIRELESS_CHARGING_DEFAULT_TIMESTAMP = -1L;

    @VisibleForTesting

    static final long WIRELESS_CHARGING_NOTIFICATION_THRESHOLD_MILLIS =

            Duration.ofDays(30).toMillis();

    @VisibleForTesting

    static final String WIRELESS_CHARGING_WARNING_ENABLED = "wireless_charging_warning_enabled";

    private static Signature[] sSystemSignature;

    private static String sPermissionControllerPackageName;

    private static String sServicesSystemSharedLibPackageName;

    private static final String PERCENTAGE_49 = "49%";

    private static final String PERCENTAGE_50 = "50%";

    private static final String PERCENTAGE_100 = "100%";

    private static final long CURRENT_TIMESTAMP = System.currentTimeMillis();

    private AudioManager mAudioManager;

    private Context mContext;