Switch to using expectAsync0() to address some deprecation warnings.

pkg/analysis_server/test/integration/integration_tests.dart

Index: pkg/analysis_server/test/integration/integration_tests.dart
diff --git a/pkg/analysis_server/test/integration/integration_tests.dart b/pkg/analysis_server/test/integration/integration_tests.dart
index 1eee7aa7a0f2f4a9beaa1e313f2eb4c5d9603a31..ebd6ff8d501d678acb37f3ccd56adf6208f1077f 100644
--- a/pkg/analysis_server/test/integration/integration_tests.dart
+++ b/pkg/analysis_server/test/integration/integration_tests.dart
@@ -752,7 +752,7 @@ class Server {
     // and is outputting a stacktrace, because it ensures that we see the
     // entire stacktrace.  Use expectAsync() to prevent the test from
     // ending during this 1 second.
-    new Future.delayed(new Duration(seconds: 1), expectAsync(() {
+    new Future.delayed(new Duration(seconds: 1), expectAsync0(() {
       fail('Bad data received from server: $details');
     }));
   }