Remove ConstantExpression.value

pkg/compiler/lib/src/native/behavior.dart

Index: pkg/compiler/lib/src/native/behavior.dart
diff --git a/pkg/compiler/lib/src/native/behavior.dart b/pkg/compiler/lib/src/native/behavior.dart
index 6e6c53a8e357c9ace885c2333992ee334e8ae04c..3fb1c4bf5c3680fd7e3090429226edbb50a86864 100644
--- a/pkg/compiler/lib/src/native/behavior.dart
+++ b/pkg/compiler/lib/src/native/behavior.dart
@@ -689,7 +689,8 @@ class NativeBehavior {
          !link.isEmpty;
          link = link.tail) {
       MetadataAnnotation annotation = link.head.ensureResolved(compiler);
-      ConstantValue value = annotation.constant.value;
+      ConstantValue value =
+          compiler.constants.getConstantValue(annotation.constant);
       if (!value.isConstructedObject) continue;
       ConstructedConstantValue constructedObject = value;
       if (constructedObject.type.element != annotationClass) continue;