Add --modules=node support

test/browser/runtime_tests.js

 // 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.
 
 var assert = chai.assert;
 var core = dart_library.import('dart/core');
 var collection = dart_library.import('dart/collection');
 var dart = dart_library.import('dart/_runtime');
 var dartx = dart.dartx;
 
 suite('generic', () => {
   "use strict";
 
   let generic = dart.generic;
 
   test('zero arguments is not allowed', () => {
     assert.throws(() => { generic(function(){}); });
   });
 
   test('dcall noSuchMethod has correct error target', () => {
     assert.throws(() => dart.dcall(42),
         new RegExp('NoSuchMethodError.*\nReceiver: 42', 'm'),
         'Calls with non-function receiver should throw a NoSuchMethodError' +
         ' with correct target');
-    
+
     // TODO(jmesserly): we should show the name "print" in there somewhere.
     assert.throws(() => dart.dcall(core.print, 1, 2, 3),
         new RegExp('NoSuchMethodError.*\n' +
         "Receiver: Instance of '\\(Object\\) -> void'", 'm'),
         'Calls with incorrect argument types should throw a NoSuchMethodError' +
         ' with correct target');
   });
 
   test('can throw number', () => {
     try {
@@ skipping 748 matching lines @@
 
 suite('primitives', function() {
   'use strict';
 
   test('fixed length list', () => {
     let list = new core.List(10);
     list[0] = 42;
     assert.throws(() => list.add(42));
   });
 });