Address comment from CL 14993002.

R=nweiz@google.com

Review URL: https://codereview.chromium.org//16950010

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@24000 260f80e4-7a28-3924-810f-c04153c831b5

test/error_group_test.dart

@@ -64,13 +64,13 @@ main() {
         "been called", () {
       completer.complete('value');
 
-      completer.future.then(expectAsync1((_) {
-        expect(() => errorGroup.registerFuture(new Future.value()),
+      expect(completer.future
+                 .then((_) => errorGroup.registerFuture(new Future.value())),
+             throwsStateError);
+      expect(completer.future
+                 .then((_) => errorGroup.registerStream(
+                     new StreamController(sync: true).stream)),
             throwsStateError);
-        expect(() => errorGroup.registerStream(
-            new StreamController(sync: true).stream),
-            throwsStateError);
-      }));
     });
 
     test('should pass through an exception from the future if it has a '