Disable closure wrapping by default

test/dart_codegen/expect/d/d.dart

Index: test/dart_codegen/expect/d/d.dart
diff --git a/test/dart_codegen/expect/d/d.dart b/test/dart_codegen/expect/d/d.dart
index 54660230ca7ad76ef502ed2fe93f24e4fddf7fe7..6aff212dcf06558652feb4193954e019138b12ba 100644
--- a/test/dart_codegen/expect/d/d.dart
+++ b/test/dart_codegen/expect/d/d.dart
@@ -8,16 +8,10 @@ void foo() {
   var x = f3(((__x0) => DEVC$RT.cast(__x0, dynamic, DDC$a$.A, "DynamicCast",
       """line 10, column 14 of test/dart_codegen/types/d.dart: """,
       __x0 is DDC$a$.A, true))(f4("""hello""")));
-  var y = f1(DEVC$RT.wrap((dynamic f(dynamic __u2)) {
-    dynamic c(dynamic x0) => ((__x1) => DEVC$RT.cast(__x1, dynamic, DDC$a$.A,
-        "CastResult",
-        """line 11, column 14 of test/dart_codegen/types/d.dart: """,
-        __x1 is DDC$a$.A, true))(f(x0));
-    return f == null ? null : c;
-  }, f4, __t5, __t3, "Wrap",
-      """line 11, column 14 of test/dart_codegen/types/d.dart: """,
-      f4 is __t3));
+  var y = f1(DEVC$RT.cast(f4, __t3, __t1, "CompositeCast",
+      """line 11, column 14 of test/dart_codegen/types/d.dart: """, f4 is __t1,
+      false));
   var z = f2(f3);
 }
-typedef DDC$a$.A __t3(DDC$a$.A __u4);
-typedef dynamic __t5(dynamic __u6);
+typedef DDC$a$.A __t1(DDC$a$.A __u2);
+typedef dynamic __t3(dynamic __u4);