Access NativeData only through ClosedWorld

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

Index: pkg/compiler/lib/src/js_backend/frequency_namer.dart
diff --git a/pkg/compiler/lib/src/js_backend/frequency_namer.dart b/pkg/compiler/lib/src/js_backend/frequency_namer.dart
index 5f114d7e705176f998a041cacd70f66d6c565d63..697ff21a0b85a4dbbfaab7e1763dfcb2ed0ec386 100644
--- a/pkg/compiler/lib/src/js_backend/frequency_namer.dart
+++ b/pkg/compiler/lib/src/js_backend/frequency_namer.dart
@@ -28,9 +28,9 @@ class FrequencyBasedNamer extends Namer
   jsAst.Name get staticsPropertyName =>
       _staticsPropertyName ??= getFreshName(instanceScope, 'static');
 
-  FrequencyBasedNamer(NativeData nativeData, ClosedWorld closedWorld,
-      CodegenWorldBuilder codegenWorldBuilder)
-      : super(nativeData, closedWorld, codegenWorldBuilder) {
+  FrequencyBasedNamer(
+      ClosedWorld closedWorld, CodegenWorldBuilder codegenWorldBuilder)
+      : super(closedWorld, codegenWorldBuilder) {
     fieldRegistry = new _FieldNamingRegistry(this);
   }