Handle static fields in js_model/model_test

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

Index: pkg/compiler/lib/src/js_model/js_strategy.dart
diff --git a/pkg/compiler/lib/src/js_model/js_strategy.dart b/pkg/compiler/lib/src/js_model/js_strategy.dart
index 972fda507438b14b898529b6230ff240579b07f3..0ab3cb3ff8ab08ceb7c8a8d4586020dec2196aae 100644
--- a/pkg/compiler/lib/src/js_model/js_strategy.dart
+++ b/pkg/compiler/lib/src/js_model/js_strategy.dart
@@ -123,7 +123,7 @@ class JsBackendStrategy implements KernelBackendStrategy {
           uses.map(_map.toBackendClass).toSet();
     });
 
-    return new JsClosedWorld(
+    return new JsClosedWorld(_elementMap,
         elementEnvironment: _elementEnvironment,
         dartTypes: _elementMap.types,
         commonElements: _commonElements,
@@ -135,10 +135,10 @@ class JsBackendStrategy implements KernelBackendStrategy {
         classSets: classSets,
         implementedClasses: implementedClasses,
         liveInstanceMembers: liveInstanceMembers,
+        mixinUses: mixinUses,
         // TODO(johnniwinther): Support these.
         allTypedefs: new ImmutableEmptySet<TypedefElement>(),
         resolutionWorldBuilder: null,
-        mixinUses: mixinUses,
         typesImplementedBySubclasses: null);
   }