closure fields must set isStatic

pkg/compiler/lib/src/js_model/closure.dart

Index: pkg/compiler/lib/src/js_model/closure.dart
diff --git a/pkg/compiler/lib/src/js_model/closure.dart b/pkg/compiler/lib/src/js_model/closure.dart
index 4a463a65534ff3e17022bcb05c368def029129ed..3a90f6562955abb4c67267e0a7da50a2a9eccc3a 100644
--- a/pkg/compiler/lib/src/js_model/closure.dart
+++ b/pkg/compiler/lib/src/js_model/closure.dart
@@ -388,7 +388,7 @@ class JClosureField extends JField {
       KernelClosureClass containingClass, bool isConst, bool isAssignable)
       : super(memberIndex, containingClass.library, containingClass,
             new Name(name, containingClass.library),
-            isAssignable: isAssignable, isConst: isConst);
+            isAssignable: isAssignable, isConst: isConst, isStatic: false);
 }
 
 /// A ClosureField that has been "boxed" to prevent name shadowing with the