Bring js_model/model_test on par with compile_from_dill tests.

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

 // Copyright (c) 2017, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library dart2js.js_model.strategy;
 
 import '../closure.dart' show ClosureConversionTask;
 import '../common/tasks.dart';
 import '../common_elements.dart';
 import '../compiler.dart';
@@ skipping 105 matching lines @@
     List<MemberEntity> liveInstanceMembers =
         closedWorld.liveInstanceMembers.map(_map.toBackendMember).toList();
 
     Map<ClassEntity, Set<ClassEntity>> mixinUses =
         <ClassEntity, Set<ClassEntity>>{};
     closedWorld.mixinUses.forEach((ClassEntity cls, Set<ClassEntity> uses) {
       mixinUses[_map.toBackendClass(cls)] =
           uses.map(_map.toBackendClass).toSet();
     });
 
+    Iterable<MemberEntity> assignedInstanceMembers =
+        closedWorld.assignedInstanceMembers.map(_map.toBackendMember).toList();
+
     return new JsClosedWorld(_elementMap,
         elementEnvironment: _elementEnvironment,
         dartTypes: _elementMap.types,
         commonElements: _commonElements,
         constantSystem: const JavaScriptConstantSystem(),
         backendUsage: backendUsage,
         nativeData: nativeData,
         interceptorData: interceptorData,
         classHierarchyNodes: classHierarchyNodes,
         classSets: classSets,
         implementedClasses: implementedClasses,
         liveInstanceMembers: liveInstanceMembers,
+        assignedInstanceMembers: assignedInstanceMembers,
         // TODO(johnniwinther): Support these.
         allTypedefs: new ImmutableEmptySet<TypedefElement>(),
-        resolutionWorldBuilder: null,
         mixinUses: mixinUses,
         typesImplementedBySubclasses: null);
   }
 
   @override
   Sorter get sorter {
     return _sorter ??= new KernelSorter(elementMap);
   }
 
   @override
@@ skipping 23 matching lines @@
       ClosedWorld closedWorld,
       SelectorConstraintsStrategy selectorConstraintsStrategy) {
     return new KernelCodegenWorldBuilder(
         elementMap,
         closedWorld.elementEnvironment,
         nativeBasicData,
         closedWorld,
         selectorConstraintsStrategy);
   }
 }