Add --modules=node support

tool/input_sdk/private/js_mirrors.dart

 // Copyright (c) 2015, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library dart._js_mirrors;
 
 import 'dart:mirrors';
 import 'dart:_foreign_helper' show JS;
 import 'dart:_internal' as _internal;
 
 String getName(Symbol symbol) =>
     _internal.Symbol.getName(symbol as _internal.Symbol);
 
 Symbol getSymbol(name, library) =>
     throw new UnimplementedError("MirrorSystem.getSymbol unimplemented");
 
 final currentJsMirrorSystem = throw new UnimplementedError(
     "MirrorSystem.currentJsMirrorSystem unimplemented");
 
 InstanceMirror reflect(reflectee) => new JsInstanceMirror._(reflectee);
 
 TypeMirror reflectType(Type key) {
   // TODO(vsm): Might not be a class.
   return new JsClassMirror._(key);
 }
 
 final dynamic _dart = JS('', 'dart');
-final _metadata = JS('', '#.metadata', _dart);
 
 dynamic _dload(obj, String name) {
   return JS('', '#.dload(#, #)', _dart, obj, name);
 }
 
 void _dput(obj, String name, val) {
   JS('', '#.dput(#, #, #)', _dart, obj, name, val);
 }
 
 dynamic _dsend(obj, String name, List args) {
@@ skipping 307 matching lines @@
       throw new UnimplementedError("MethodMirror.owner unimplemented");
   Symbol get qualifiedName =>
       throw new UnimplementedError("MethodMirror.qualifiedName unimplemented");
   TypeMirror get returnType =>
       throw new UnimplementedError("MethodMirror.returnType unimplemented");
   Symbol get simpleName =>
       throw new UnimplementedError("MethodMirror.simpleName unimplemented");
   String get source =>
       throw new UnimplementedError("MethodMirror.source unimplemented");
 }