Fixing DateTime values in dart2js serialized script values.

tools/dom/src/dart2js_Conversions.dart

 // Copyright (c) 2012, 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.
 
 
 // Conversions for Window.  These check if the window is the local
 // window, and if it's not, wraps or unwraps it with a secure wrapper.
 // We need to test for EventTarget here as well as it's a base type.
 // We omit an unwrapper for Window as no methods take a non-local
 // window as a parameter.
 
 part of html;
 
-DateTime _convertNativeToDart_DateTime(date) {
-  var millisSinceEpoch = JS('int', '#.getTime()', date);
-  return new DateTime.fromMillisecondsSinceEpoch(millisSinceEpoch, isUtc: true);
-}
-
-_convertDartToNative_DateTime(DateTime date) {
-  return JS('', 'new Date(#)', date.millisecondsSinceEpoch);
-}
-
 WindowBase _convertNativeToDart_Window(win) {
   if (win == null) return null;
   return _DOMWindowCrossFrame._createSafe(win);
 }
 
 EventTarget _convertNativeToDart_EventTarget(e) {
   if (e == null) {
     return null;
   }
   // Assume it's a Window if it contains the setInterval property.  It may be
@@ skipping 11 matching lines @@
     return e;
 }
 
 EventTarget _convertDartToNative_EventTarget(e) {
   if (e is _DOMWindowCrossFrame) {
     return e._window;
   } else {
     return e;
   }
 }