Generative constructor factories for native objects

tests/compiler/dart2js_native/oddly_named_fields_test.dart

 // Copyright (c) 2013, 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.
 
 import 'dart:_js_helper';
 
 // JavaScript reserved words:
 //
 // break
 // case
@@ skipping 1351 matching lines @@
   if (object.withValue) throw 'incorrect value in "withValue"';
 
   if (object.yieldValue == null)
     throw 'incorrect initialization of "yieldValue"';
   object.yieldValue = true;
   if (!object.yieldValue) throw 'incorrect value in "yieldValue"';
   object.yieldValue = false;
   if (object.yieldValue) throw 'incorrect value in "yieldValue"';
 }
 
-makeNativeClassWithOddNames() native;
+NativeClassWithOddNames makeNativeClassWithOddNames() native;
 
 setup() native """
 function NativeClassWithOddNames() {}
 makeNativeClassWithOddNames = function() { return new NativeClassWithOddNames; }
 """;
 
 main() {
   setup();
-  var object = new NativeClassWithOddNames();
+  var object = makeNativeClassWithOddNames();
   object.testMyFields();
   testObjectStronglyTyped(object);
   testObjectWeaklyTyped([object]);
   testObjectWeaklyTyped(['fisk']);
   testObjectWeaklyTyped([new ClassWithOddNames()..testMyFields()]);
 }