Remove unused AppOpsManager references

import static android.hardware.biometrics.BiometricAuthenticator.TYPE_NONE;

import android.app.ActivityManager;

import android.app.AppOpsManager;

import android.app.IActivityManager;

import android.app.KeyguardManager;

import android.app.UserSwitchObserver;

    private final Injector mInjector;

    @VisibleForTesting

    final IBiometricService.Stub mImpl;

    private final AppOpsManager mAppOps;

    private final boolean mHasFeatureFingerprint;

    private final boolean mHasFeatureIris;

    private final boolean mHasFeatureFace;

        }

    }

    private void checkAppOp(String opPackageName, int callingUid) {

        if (mAppOps.noteOp(AppOpsManager.OP_USE_BIOMETRIC, callingUid,

                opPackageName) != AppOpsManager.MODE_ALLOWED) {

            Slog.w(TAG, "Rejecting " + opPackageName + "; permission denied");

            throw new SecurityException("Permission denied");

        }

    }

    private void checkInternalPermission() {

        getContext().enforceCallingOrSelfPermission(USE_BIOMETRIC_INTERNAL,

                "Must have USE_BIOMETRIC_INTERNAL permission");

        mInjector = injector;

        mImpl = new BiometricServiceWrapper();

        mAppOps = context.getSystemService(AppOpsManager.class);

        mEnabledOnKeyguardCallbacks = new ArrayList<>();

        mSettingObserver = mInjector.getSettingObserver(context, mHandler,

                mEnabledOnKeyguardCallbacks);