Use new no overlay flag instead app ops

Test: updated DrawOverlayDetailsTest passes

bug:66936547

Change-Id: I7c17c95a2b44fd2ffd593a6eb03a16be034e9192

src/com/android/settings/core/TouchOverlayManager.java

@@ -1,40 +0,0 @@
-/*
- * Copyright (C) 2017 The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License
- */
-
-package com.android.settings.core;
-
-import android.app.AppOpsManager;
-import android.content.Context;
-import android.os.Binder;
-import android.os.IBinder;
-
-public class TouchOverlayManager {
-
-    private final Context mContext;
-    private final IBinder mToken = new Binder();
-
-    public TouchOverlayManager(Context context) {
-        mContext = context;
-    }
-
-    public void setOverlayAllowed(boolean allowed) {
-        final AppOpsManager aom = mContext.getSystemService(AppOpsManager.class);
-        if (aom != null) {
-            aom.setUserRestriction(AppOpsManager.OP_SYSTEM_ALERT_WINDOW, !allowed, mToken);
-            aom.setUserRestriction(AppOpsManager.OP_TOAST_WINDOW, !allowed, mToken);
-        }
-    }
-}