Access NativeData only through ClosedWorld

tests/compiler/dart2js/jsinterop/world_test.dart

 // Copyright (c) 2016, 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 jsinterop.world_test;
 
 import 'package:expect/expect.dart';
 import 'package:async_helper/async_helper.dart';
 import 'package:compiler/src/common.dart';
 import 'package:compiler/src/elements/elements.dart'
@@ skipping 98 matching lines @@
     Expect.equals(Interceptor.superclass, Object_);
     Expect.equals(JavaScriptObject.superclass, Interceptor);
 
     Expect.equals(A.superclass, JavaScriptObject);
     Expect.equals(B.superclass, JavaScriptObject);
     Expect.equals(C.superclass, JavaScriptObject);
     Expect.equals(D.superclass, JavaScriptObject);
     Expect.equals(E.superclass, Object_);
     Expect.equals(F.superclass, Object_);
 
-    Expect.isFalse(backend.nativeData.isJsInteropClass(Object_));
-    Expect.isTrue(backend.nativeData.isJsInteropClass(A));
-    Expect.isTrue(backend.nativeData.isJsInteropClass(B));
-    Expect.isTrue(backend.nativeData.isJsInteropClass(C));
-    Expect.isTrue(backend.nativeData.isJsInteropClass(D));
-    Expect.isFalse(backend.nativeData.isJsInteropClass(E));
-    Expect.isFalse(backend.nativeData.isJsInteropClass(F));
+    Expect.isFalse(world.nativeData.isJsInteropClass(Object_));
+    Expect.isTrue(world.nativeData.isJsInteropClass(A));
+    Expect.isTrue(world.nativeData.isJsInteropClass(B));
+    Expect.isTrue(world.nativeData.isJsInteropClass(C));
+    Expect.isTrue(world.nativeData.isJsInteropClass(D));
+    Expect.isFalse(world.nativeData.isJsInteropClass(E));
+    Expect.isFalse(world.nativeData.isJsInteropClass(F));
 
-    Expect.isFalse(backend.nativeData.isAnonymousJsInteropClass(Object_));
-    Expect.isFalse(backend.nativeData.isAnonymousJsInteropClass(A));
-    Expect.isFalse(backend.nativeData.isAnonymousJsInteropClass(B));
-    Expect.isTrue(backend.nativeData.isAnonymousJsInteropClass(C));
-    Expect.isTrue(backend.nativeData.isAnonymousJsInteropClass(D));
-    Expect.isFalse(backend.nativeData.isAnonymousJsInteropClass(E));
-    Expect.isFalse(backend.nativeData.isAnonymousJsInteropClass(F));
+    Expect.isFalse(world.nativeData.isAnonymousJsInteropClass(Object_));
+    Expect.isFalse(world.nativeData.isAnonymousJsInteropClass(A));
+    Expect.isFalse(world.nativeData.isAnonymousJsInteropClass(B));
+    Expect.isTrue(world.nativeData.isAnonymousJsInteropClass(C));
+    Expect.isTrue(world.nativeData.isAnonymousJsInteropClass(D));
+    Expect.isFalse(world.nativeData.isAnonymousJsInteropClass(E));
+    Expect.isFalse(world.nativeData.isAnonymousJsInteropClass(F));
 
-    Expect.equals('', backend.nativeData.getJsInteropClassName(A));
-    Expect.equals('BClass', backend.nativeData.getJsInteropClassName(B));
-    Expect.equals('', backend.nativeData.getJsInteropClassName(C));
-    Expect.equals('', backend.nativeData.getJsInteropClassName(D));
+    Expect.equals('', world.nativeData.getJsInteropClassName(A));
+    Expect.equals('BClass', world.nativeData.getJsInteropClassName(B));
+    Expect.equals('', world.nativeData.getJsInteropClassName(C));
+    Expect.equals('', world.nativeData.getJsInteropClassName(D));
 
     for (String name in classEnvironment.keys) {
       ClassElement cls = classEnvironment[name];
       bool isInstantiated = false;
       if (directlyInstantiated.contains(name)) {
         isInstantiated = true;
         Expect.isTrue(
             world.isDirectlyInstantiated(cls),
             "Expected $name to be directly instantiated in `${mainSource}`:"
             "\n${world.dump(cls)}");
@@ skipping 50 matching lines @@
 
   await test('main() => newE();', directlyInstantiated: ['E']);
 
   await test('main() => newF();', directlyInstantiated: ['F']);
 
   await test('main() => [newD(), newE()];',
       directlyInstantiated: ['E'],
       abstractlyInstantiated: ['A', 'B', 'C', 'D'],
       indirectlyInstantiated: ['Object', 'Interceptor', 'JavaScriptObject']);
 }