Test the CapturedScope for local functions

tests/compiler/dart2js/serialization/model_test_helper.dart

Index: tests/compiler/dart2js/serialization/model_test_helper.dart
diff --git a/tests/compiler/dart2js/serialization/model_test_helper.dart b/tests/compiler/dart2js/serialization/model_test_helper.dart
index 34b497cd7e46df6f24c9f17dbc5fa85fb0710611..b176593ca7f365f7adfc23d6ae22d47ff2f8c5f0 100644
--- a/tests/compiler/dart2js/serialization/model_test_helper.dart
+++ b/tests/compiler/dart2js/serialization/model_test_helper.dart
@@ -255,7 +255,7 @@ bool areCapturedVariablesEquivalent(FieldEntity a, FieldEntity b) {
 bool areCapturedScopesEquivalent(CapturedScope a, CapturedScope b) {
   if (a == b) return true;
   if (a == null || b == null) return false;
-  if (!areLocalsEquivalent(a.context, b.context)) {
+  if (!areLocalsEquivalent(a.box, b.box)) {
     return false;
   }
   if (!areLocalsEquivalent(a.thisLocal, b.thisLocal)) {