Fix annotation of promoted parameters in Fasta inference tests.

pkg/front_end/testcases/inference/downwards_inference_for_each.dart

 // Copyright (c) 2017, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 /*@testedFeatures=inference*/
 library test;
 
 import 'dart:async';
 
 abstract class MyStream<T> extends Stream<T> {
   factory MyStream() => null;
 }
 
 Future main() async {
-  for (int /*@promotedType=none*/ x in /*@typeArgs=int*/ [1, 2, 3]) {}
-  await for (int /*@promotedType=none*/ x
-      in new /*@typeArgs=int*/ MyStream()) {}
+  for (int x in /*@typeArgs=int*/ [1, 2, 3]) {}
+  await for (int x in new /*@typeArgs=int*/ MyStream()) {}
 }