Update expectations for instance creations to match front_end.

pkg/front_end/testcases/inference/future_union_downwards.dart

Index: pkg/front_end/testcases/inference/future_union_downwards.dart
diff --git a/pkg/front_end/testcases/inference/future_union_downwards.dart b/pkg/front_end/testcases/inference/future_union_downwards.dart
index b2c00fccf2c1c98d77d38f21e8664a93226ef621..fd3c9bed94646babb5180574e4e2bef3ed5428e0 100644
--- a/pkg/front_end/testcases/inference/future_union_downwards.dart
+++ b/pkg/front_end/testcases/inference/future_union_downwards.dart
@@ -17,7 +17,7 @@ class MyFuture<T> implements Future<T> {
 MyFuture f;
 // Instantiates Future<int>
 Future<int> t1 = f.then(/*@returnType=Future<int>*/ (/*@type=dynamic*/ _) =>
-    /*@typeArgs=int*/ new Future.value('hi'));
+    new /*@typeArgs=int*/ Future.value('hi'));
 
 // Instantiates List<int>
 Future<List<int>> t2 = f.then(
@@ -27,6 +27,6 @@ Future<List<int>> g2() async {
 }
 
 Future<List<int>> g3() async {
-  return /*@typeArgs=List<int>*/ new Future.value(
+  return new /*@typeArgs=List<int>*/ Future.value(
       /*@typeArgs=int*/ [3]);
 }