Add NativeClassData/NativeClassDataBuilder

pkg/compiler/lib/src/js_backend/interceptor_data.dart

Index: pkg/compiler/lib/src/js_backend/interceptor_data.dart
diff --git a/pkg/compiler/lib/src/js_backend/interceptor_data.dart b/pkg/compiler/lib/src/js_backend/interceptor_data.dart
index 3d2009f25fcb86fb3b9c1539f1f9998d72b5bbf8..5ada3f26067a8e005fd46d1d534c5a283a20d28e 100644
--- a/pkg/compiler/lib/src/js_backend/interceptor_data.dart
+++ b/pkg/compiler/lib/src/js_backend/interceptor_data.dart
@@ -46,7 +46,7 @@ abstract class InterceptorDataBuilder {
 }
 
 class InterceptorDataImpl implements InterceptorData {
-  final NativeData _nativeData;
+  final NativeClassData _nativeData;
   final BackendHelpers _helpers;
   final ClosedWorld _closedWorld;
 
@@ -214,7 +214,7 @@ class InterceptorDataImpl implements InterceptorData {
 }
 
 class InterceptorDataBuilderImpl implements InterceptorDataBuilder {
-  final NativeData _nativeData;
+  final NativeClassData _nativeData;
   final BackendHelpers _helpers;
   final CommonElements _commonElements;
   final Resolution _resolution;