Add type info to fix analyzer failure, missed this one change in previous cl

lib/src/util/stream_queue.dart

Index: lib/src/util/stream_queue.dart
diff --git a/lib/src/util/stream_queue.dart b/lib/src/util/stream_queue.dart
index c37c2ca05d8072d780ae917ce0c70c9bfa930f6a..65c58b21bf615ebad109b9525b7c90905d00e169 100644
--- a/lib/src/util/stream_queue.dart
+++ b/lib/src/util/stream_queue.dart
@@ -440,7 +440,7 @@ class _NextRequest<T> implements _EventRequest {
 
   void close(Queue<Result> events) {
     var errorFuture =
-        new Future.sync(() => throw new StateError("No elements"));
+        new Future<T>.sync(() => throw new StateError("No elements"));
     _completer.complete(errorFuture);
   }
 }