Remove use of MockLooper AutoDispatch from non-blocking calls

AutoDispatch is not needed with non-blocking sendMessage calls.  Remove
two instances of this error.

BUG=27278081

Change-Id: Id346d76e971c361149ae885a8b8056660b61e5f3
diff --git a/service/tests/wifitests/src/com/android/server/wifi/WifiStateMachineTest.java b/service/tests/wifitests/src/com/android/server/wifi/WifiStateMachineTest.java
index a8d06ac..2ab308a 100644
--- a/service/tests/wifitests/src/com/android/server/wifi/WifiStateMachineTest.java
+++ b/service/tests/wifitests/src/com/android/server/wifi/WifiStateMachineTest.java
@@ -765,9 +765,8 @@
         dhcpResults.addDns("8.8.8.8");
         dhcpResults.setLeaseDuration(3600);
 
-        mLooper.startAutoDispatch();
         mTestIpManager.injectDhcpSuccess(dhcpResults);
-        mLooper.stopAutoDispatch();
+        mLooper.dispatchAll();
 
         assertEquals("ConnectedState", getCurrentState().getName());
     }
@@ -794,9 +793,8 @@
 
         assertEquals("ObtainingIpState", getCurrentState().getName());
 
-        mLooper.startAutoDispatch();
         mTestIpManager.injectDhcpFailure();
-        mLooper.stopAutoDispatch();
+        mLooper.dispatchAll();
 
         assertEquals("DisconnectingState", getCurrentState().getName());
     }