Fix dangling ddc references in libraries.dart

pkg/dev_compiler/lib/js/es6/dart_sdk.js

Index: pkg/dev_compiler/lib/js/es6/dart_sdk.js
diff --git a/pkg/dev_compiler/lib/js/es6/dart_sdk.js b/pkg/dev_compiler/lib/js/es6/dart_sdk.js
index 29dafa9e87d05e2fed73e1a082ec435ae3fabb8a..513173aab1962144113db0253a9430574fbb6595 100644
--- a/pkg/dev_compiler/lib/js/es6/dart_sdk.js
+++ b/pkg/dev_compiler/lib/js/es6/dart_sdk.js
@@ -30,6 +30,7 @@ export const svg$ = Object.create(null);
 export const web_audio = Object.create(null);
 export const web_gl = Object.create(null);
 export const web_sql = Object.create(null);
+export const nativewrappers = Object.create(null);
 let ListOfObject = () => (ListOfObject = dart.constFn(core.List$(core.Object)))();
 let JSArrayOfListOfObject = () => (JSArrayOfListOfObject = dart.constFn(_interceptors.JSArray$(ListOfObject())))();
 let JSArrayOfObject = () => (JSArrayOfObject = dart.constFn(_interceptors.JSArray$(core.Object)))();
@@ -105448,4 +105449,4 @@ dart.setSignature(web_sql.SqlTransaction, {
   methods: () => ({[dartx.executeSql]: dart.definiteFunctionType(dart.void, [core.String, ListOfObject()], [web_sql.SqlStatementCallback, web_sql.SqlStatementErrorCallback])})
 });
 dart.registerExtension(dart.global.SQLTransaction, web_sql.SqlTransaction);
-dart.trackLibraries("dart_sdk", {"dart:_runtime": dart, "dart:_debugger": _debugger, "dart:_foreign_helper": _foreign_helper, "dart:_interceptors": _interceptors, "dart:_internal": _internal, "dart:_isolate_helper": _isolate_helper, "dart:_js_embedded_names": _js_embedded_names, "dart:_js_helper": _js_helper, "dart:_js_mirrors": _js_mirrors, "dart:_js_primitives": _js_primitives, "dart:_metadata": _metadata, "dart:_native_typed_data": _native_typed_data, "dart:async": async, "dart:collection": collection, "dart:convert": convert, "dart:core": core, "dart:developer": developer, "dart:io": io, "dart:isolate": isolate$, "dart:js": js, "dart:js_util": js_util, "dart:math": math, "dart:mirrors": mirrors, "dart:typed_data": typed_data, "dart:indexed_db": indexed_db, "dart:html": html$, "dart:html_common": html_common, "dart:svg": svg$, "dart:web_audio": web_audio, "dart:web_gl": web_gl, "dart:web_sql": web_sql});
+dart.trackLibraries("dart_sdk", {"dart:_runtime": dart, "dart:_debugger": _debugger, "dart:_foreign_helper": _foreign_helper, "dart:_interceptors": _interceptors, "dart:_internal": _internal, "dart:_isolate_helper": _isolate_helper, "dart:_js_embedded_names": _js_embedded_names, "dart:_js_helper": _js_helper, "dart:_js_mirrors": _js_mirrors, "dart:_js_primitives": _js_primitives, "dart:_metadata": _metadata, "dart:_native_typed_data": _native_typed_data, "dart:async": async, "dart:collection": collection, "dart:convert": convert, "dart:core": core, "dart:developer": developer, "dart:io": io, "dart:isolate": isolate$, "dart:js": js, "dart:js_util": js_util, "dart:math": math, "dart:mirrors": mirrors, "dart:typed_data": typed_data, "dart:indexed_db": indexed_db, "dart:html": html$, "dart:html_common": html_common, "dart:svg": svg$, "dart:web_audio": web_audio, "dart:web_gl": web_gl, "dart:web_sql": web_sql, "dart:nativewrappers": nativewrappers});