Move nativeInfo encoding into NativeGenerator.

pkg/compiler/lib/src/js_emitter/old_emitter/emitter.dart

Index: pkg/compiler/lib/src/js_emitter/old_emitter/emitter.dart
diff --git a/pkg/compiler/lib/src/js_emitter/old_emitter/emitter.dart b/pkg/compiler/lib/src/js_emitter/old_emitter/emitter.dart
index bb2f2b2aa991b4c9480a7f19d0deb7b313bae4a1..3971f3e7dc7fb14f660488edf4f727f371f8beb7 100644
--- a/pkg/compiler/lib/src/js_emitter/old_emitter/emitter.dart
+++ b/pkg/compiler/lib/src/js_emitter/old_emitter/emitter.dart
@@ -328,10 +328,10 @@ class OldEmitter implements Emitter {
       jsAst.Expression subclassReadGenerator(jsAst.Expression subclass),
       jsAst.Expression interceptorsByTagAccess,
       jsAst.Expression leafTagsAccess) {
-    return nativeEmitter.buildNativeInfoHandler(infoAccess, constructorAccess,
-                                                subclassReadGenerator,
-                                                interceptorsByTagAccess,
-                                                leafTagsAccess);
+    new NativeGenerator().buildNativeInfoHandler(infoAccess, constructorAccess,
+                                                 subclassReadGenerator,
+                                                 interceptorsByTagAccess,
+                                                 leafTagsAccess);
   }
 
   jsAst.ObjectInitializer generateInterceptedNamesSet() {