Fix annotation of promoted parameters in Fasta inference tests.

pkg/front_end/testcases/inference/future_then_upwards_from_block.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';
 
 main() {
   Future<int> base;
   var /*@type=Future<bool>*/ f = /*@promotedType=none*/ base
       .then(/*@returnType=bool*/ (/*@type=int*/ x) {
-    return x == 0;
+    return /*@promotedType=none*/ x == 0;
   });
-  var /*@type=Future<bool>*/ g = /*@promotedType=none*/ base
-      .then(/*@returnType=bool*/ (/*@type=int*/ x) => x == 0);
+  var /*@type=Future<bool>*/ g = /*@promotedType=none*/ base.then(
+      /*@returnType=bool*/ (/*@type=int*/ x) => /*@promotedType=none*/ x == 0);
   Future<bool> b = /*@promotedType=none*/ f;
   b = /*@promotedType=none*/ g;
 }