Remove call to WifiManager.setWifiApEnabled().

- replace it with ConnectivityManager.stopTethering() instead.

Change-Id: I112863b1be37c0fef5d59c16d73f0c6cf71c6dea
Fix: 62191978
Test: make RunSettingsRoboTests

src/com/android/settings/wifi/ConnectivityManagerWrapper.java

@@ -0,0 +1,36 @@
+/*
+ * 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.wifi;
+
+import android.net.ConnectivityManager;
+
+/**
+ * Wrapper around {@link ConnectivityManager} to facilitate unit testing.
+ */
+public class ConnectivityManagerWrapper {
+    private final ConnectivityManager mConnectivityManager;
+
+    public ConnectivityManagerWrapper(ConnectivityManager connectivityManager) {
+        mConnectivityManager = connectivityManager;
+    }
+
+    /**
+     * {@link ConnectivityManager#stopTethering}
+     */
+    public void stopTethering(int type) {
+        mConnectivityManager.stopTethering(type);
+    }
+}