Add NativeClassData/NativeClassDataBuilder

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

Index: pkg/compiler/lib/src/js_backend/minify_namer.dart
diff --git a/pkg/compiler/lib/src/js_backend/minify_namer.dart b/pkg/compiler/lib/src/js_backend/minify_namer.dart
index 2871687c17c53e6c817ba3b65e2b3f808a121cfe..ebf5691dc69f321bb1075d8eaeec7588c75b068e 100644
--- a/pkg/compiler/lib/src/js_backend/minify_namer.dart
+++ b/pkg/compiler/lib/src/js_backend/minify_namer.dart
@@ -12,9 +12,9 @@ class MinifyNamer extends Namer
         _MinifiedFieldNamer,
         _MinifyConstructorBodyNamer,
         _MinifiedOneShotInterceptorNamer {
-  MinifyNamer(JavaScriptBackend backend, ClosedWorld closedWorld,
-      CodegenWorldBuilder codegenWorldBuilder)
-      : super(backend, closedWorld, codegenWorldBuilder) {
+  MinifyNamer(BackendHelpers helpers, NativeData nativeData,
+      ClosedWorld closedWorld, CodegenWorldBuilder codegenWorldBuilder)
+      : super(helpers, nativeData, closedWorld, codegenWorldBuilder) {
     reserveBackendNames();
     fieldRegistry = new _FieldNamingRegistry(this);
   }