Make it so client code does not tie tether to wifi

The wifi service already handles turning off tethering if
multi-interface is/isn't supported. We don't need to do tie wifi
and tethering stuff together in the UI.

Test: robotests still pass
Bug: 79213401
Change-Id: I699dfe2d7646f248a54faa5a8429176697614cdf

tests/robotests/src/com/android/settings/testutils/shadow/ShadowRestrictedLockUtils.java

@@ -89,6 +89,18 @@ public class ShadowRestrictedLockUtils {
         return (sKeyguardDisabledFeatures & features) == 0 ? null : new EnforcedAdmin();
     }
 
+    @Implementation
+    public static boolean hasBaseUserRestriction(Context context,
+            String userRestriction, int userId) {
+        return sIsRestricted;
+    }
+
+    @Implementation
+    public static EnforcedAdmin checkIfRestrictionEnforced(Context context,
+            String userRestriction, int userId) {
+        return sIsRestricted ? new EnforcedAdmin() : null;
+    }
+
     public static boolean hasAdminSupportDetailsIntentLaunched() {
         return sAdminSupportDetailsIntentLaunched;
     }

tests/robotests/src/com/android/settings/wifi/WifiEnablerTest.java

@@ -16,6 +16,8 @@
 
 package com.android.settings.wifi;
 
+import static com.google.common.truth.Truth.assertThat;
+
 import static org.mockito.Mockito.mock;
 import static org.mockito.Mockito.verify;
 import static org.mockito.Mockito.when;
@@ -25,6 +27,7 @@ import android.net.ConnectivityManager;
 import android.net.wifi.WifiManager;
 
 import com.android.settings.testutils.SettingsRobolectricTestRunner;
+import com.android.settings.testutils.shadow.ShadowRestrictedLockUtils;
 import com.android.settings.widget.SwitchWidgetController;
 import com.android.settingslib.core.instrumentation.MetricsFeatureProvider;
 
@@ -33,8 +36,10 @@ import org.junit.Test;
 import org.junit.runner.RunWith;
 import org.mockito.Mock;
 import org.mockito.MockitoAnnotations;
+import org.robolectric.annotation.Config;
 
 @RunWith(SettingsRobolectricTestRunner.class)
+@Config(shadows = ShadowRestrictedLockUtils.class)
 public class WifiEnablerTest {
 
     @Mock
@@ -59,8 +64,6 @@ public class WifiEnablerTest {
         when(mWifiManager.setWifiEnabled(true)).thenReturn(true);
         when(mWifiManager.getWifiApState()).thenReturn(WifiManager.WIFI_AP_STATE_ENABLED);
 
-        mEnabler.onSwitchToggled(true);
-
-        verify(mConnectivityManager).stopTethering(ConnectivityManager.TETHERING_WIFI);
+        assertThat(mEnabler.onSwitchToggled(true)).isTrue();
     }
 }

tests/robotests/src/com/android/settings/wifi/WifiMasterSwitchPreferenceControllerTest.java

@@ -36,6 +36,7 @@ import androidx.preference.PreferenceScreen;
 
 import com.android.settings.testutils.FakeFeatureFactory;
 import com.android.settings.testutils.SettingsRobolectricTestRunner;
+import com.android.settings.testutils.shadow.ShadowRestrictedLockUtils;
 import com.android.settings.widget.MasterSwitchPreference;
 import com.android.settingslib.core.instrumentation.MetricsFeatureProvider;
 
@@ -48,6 +49,7 @@ import org.robolectric.RuntimeEnvironment;
 import org.robolectric.annotation.Config;
 
 @RunWith(SettingsRobolectricTestRunner.class)
+@Config(shadows = ShadowRestrictedLockUtils.class)
 public class WifiMasterSwitchPreferenceControllerTest {
 
     @Mock