Fix error_group_test.

sdk/lib/_internal/pub/test/error_group_test.dart

Index: sdk/lib/_internal/pub/test/error_group_test.dart
diff --git a/sdk/lib/_internal/pub/test/error_group_test.dart b/sdk/lib/_internal/pub/test/error_group_test.dart
index db952c872730a8f708bbf80e2eb9592fc1d7b0bc..ff2f699dbacd75574e7b677a65c1bd600896746b 100644
--- a/sdk/lib/_internal/pub/test/error_group_test.dart
+++ b/sdk/lib/_internal/pub/test/error_group_test.dart
@@ -63,10 +63,12 @@ main() {
         "been called", () {
       completer.complete('value');
 
-      expect(() => errorGroup.registerFuture(new Future.value()),
-          throwsStateError);
-      expect(() => errorGroup.registerStream(new StreamController().stream),
-          throwsStateError);
+      completer.future.then(expectAsync1((_) {

[nweiz, 2013/05/07 00:18:11]

As in the other CL, convert these to "expect(completer.future.then((_) => ...),
throwsStateError)".

[floitsch, 2013/06/13 15:52:35]

done in https://codereview.chromium.org/16950010

+        expect(() => errorGroup.registerFuture(new Future.value()),
+            throwsStateError);
+        expect(() => errorGroup.registerStream(new StreamController().stream),
+            throwsStateError);
+      }));
     });
 
     test('should pass through an exception from the future if it has a '