Switch to WifiManager.{start,stop}SoftAp()

Test: as follows
    - built
    - flashed
    - booted
    - "runtest frameworks-net" passes
Bug: 31466854

Change-Id: I730d029128a14b936c111ae159b9708d935f4656
diff --git a/tests/net/java/com/android/server/connectivity/TetheringTest.java b/tests/net/java/com/android/server/connectivity/TetheringTest.java
index e527d57..35f3fcf 100644
--- a/tests/net/java/com/android/server/connectivity/TetheringTest.java
+++ b/tests/net/java/com/android/server/connectivity/TetheringTest.java
@@ -183,8 +183,6 @@
     @Test
     public void workingLocalOnlyHotspot() throws Exception {
         when(mConnectivityManager.isTetheringSupported()).thenReturn(true);
-        when(mWifiManager.setWifiApEnabled(any(WifiConfiguration.class), anyBoolean()))
-                .thenReturn(true);
 
         // Emulate externally-visible WifiManager effects, causing the
         // per-interface state machine to start up, and telling us that
@@ -234,13 +232,12 @@
     @Test
     public void workingWifiTethering() throws Exception {
         when(mConnectivityManager.isTetheringSupported()).thenReturn(true);
-        when(mWifiManager.setWifiApEnabled(any(WifiConfiguration.class), anyBoolean()))
-                .thenReturn(true);
+        when(mWifiManager.startSoftAp(any(WifiConfiguration.class))).thenReturn(true);
 
         // Emulate pressing the WiFi tethering button.
         mTethering.startTethering(ConnectivityManager.TETHERING_WIFI, null, false);
         mLooper.dispatchAll();
-        verify(mWifiManager, times(1)).setWifiApEnabled(null, true);
+        verify(mWifiManager, times(1)).startSoftAp(null);
         verifyNoMoreInteractions(mWifiManager);
         verifyNoMoreInteractions(mConnectivityManager);
         verifyNoMoreInteractions(mNMService);
@@ -286,7 +283,7 @@
         // Emulate pressing the WiFi tethering button.
         mTethering.stopTethering(ConnectivityManager.TETHERING_WIFI);
         mLooper.dispatchAll();
-        verify(mWifiManager, times(1)).setWifiApEnabled(null, false);
+        verify(mWifiManager, times(1)).stopSoftAp();
         verifyNoMoreInteractions(mWifiManager);
         verifyNoMoreInteractions(mConnectivityManager);
         verifyNoMoreInteractions(mNMService);