Include setters in KClassEnv.forEachClassMember

tests/compiler/dart2js/kernel/closed_world2_test.dart

Index: tests/compiler/dart2js/kernel/closed_world2_test.dart
diff --git a/tests/compiler/dart2js/kernel/closed_world2_test.dart b/tests/compiler/dart2js/kernel/closed_world2_test.dart
index 6d0aa7cffebff4c09f40b0742f96f3f02378d1ac..2aba723d90df910dd448a24ef794dde3ce03c424 100644
--- a/tests/compiler/dart2js/kernel/closed_world2_test.dart
+++ b/tests/compiler/dart2js/kernel/closed_world2_test.dart
@@ -57,11 +57,16 @@ const SOURCE = const {
 import 'dart:html';
 import 'package:expect/expect.dart';
 
+class ClassWithSetter {
+  void set setter(_) {}
+}
+
 @NoInline()
 main() {
   print('Hello World');
   ''.contains; // Trigger member closurization.
   new Element.div();
+  new ClassWithSetter().setter = null;
 }
 '''
 };