Split NativeData

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

Index: pkg/compiler/lib/src/js_backend/backend_serialization.dart
diff --git a/pkg/compiler/lib/src/js_backend/backend_serialization.dart b/pkg/compiler/lib/src/js_backend/backend_serialization.dart
index b9159de1451bdd4045ca4aa2f28fb1a2a84097a0..f1ea95b75ad8ea3f74e9ee09e5c708e6ef4499db 100644
--- a/pkg/compiler/lib/src/js_backend/backend_serialization.dart
+++ b/pkg/compiler/lib/src/js_backend/backend_serialization.dart
@@ -47,7 +47,7 @@ const Key NATIVE_FIELD_LOAD_BEHAVIOR = const Key('nativeFieldLoadBehavior');
 const Key NATIVE_FIELD_STORE_BEHAVIOR = const Key('nativeFieldStoreBehavior');
 
 class JavaScriptBackendSerializer implements SerializerPlugin {
-  final NativeData nativeData;
+  final NativeDataImpl nativeData;
 
   JavaScriptBackendSerializer(this.nativeData);
 
@@ -99,7 +99,7 @@ class JavaScriptBackendSerializer implements SerializerPlugin {
 }
 
 class JavaScriptBackendDeserializer implements DeserializerPlugin {
-  final NativeData nativeData;
+  final NativeDataImpl nativeData;
 
   JavaScriptBackendDeserializer(this.nativeData);