Access NativeData only through ClosedWorld

pkg/compiler/lib/src/kernel/element_map.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.kernel.element_map;
 
 import 'package:kernel/ast.dart' as ir;
 
 import '../common.dart';
 import '../common/names.dart' show Identifiers;
@@ skipping 1151 matching lines @@
     throw new UnimplementedError(
         "KernelNativeBehaviorComputer.trustJSInteropTypeAnnotations");
   }
 
   @override
   DiagnosticReporter get reporter {
     throw new UnimplementedError("KernelNativeBehaviorComputer.reporter");
   }
 
   @override
-  NativeData get nativeData {
-    throw new UnimplementedError("KernelNativeBehaviorComputer.nativeData");
+  NativeBasicData get nativeBasicData {
+    throw new UnimplementedError(
+        "KernelNativeBehaviorComputer.nativeBasicData");
   }
 }
 
 /// Constant environment mapping [ConstantExpression]s to [ConstantValue]s using
 /// [_EvaluationEnvironment] for the evaluation.
 class KernelConstantEnvironment implements ConstantEnvironment {
   KernelToElementMap _worldBuilder;
   Map<ConstantExpression, ConstantValue> _valueMap =
       <ConstantExpression, ConstantValue>{};
 
@@ skipping 118 matching lines @@
   }
 
   InterfaceType getMixinTypeForClass(KClass cls) {
     _KClassEnv env = elementMap._classEnvs[cls.classIndex];
     ir.Supertype mixedInType = env.cls.mixedInType;
     if (mixedInType == null) return null;
     return elementMap.createInterfaceType(
         mixedInType.classNode, mixedInType.typeArguments);
   }
 }