Fix error.

tools/dom/src/native_DOMImplementation.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.
 
 part of html;
 
 class _Utils {
   static double dateTimeToDouble(DateTime dateTime) =>
       dateTime.millisecondsSinceEpoch.toDouble();
   static DateTime doubleToDateTime(double dateTime) {
@@ skipping 211 matching lines @@
       _canceler();
     }
     _canceler = null;
   }
 
   bool get isActive => _canceler != null;
 }
 
 get _timerFactoryClosure =>
     (int milliSeconds, void callback(Timer timer), bool repeating) {
-  return new _Timer(milliseconds, callback, repeating);
+  return new _Timer(milliSeconds, callback, repeating);
 };
 
 
 class _PureIsolateTimer implements Timer {
   bool _isActive = true;
   final ReceivePort _port = new ReceivePort();
   SendPort _sendPort; // Effectively final.
 
   static SendPort _SEND_PORT;
 
@@ skipping 22 matching lines @@
   _send(msg) {
     _sendToHelperIsolate(msg, _sendPort);
   }
 
   bool get isActive => _isActive;
 }
 
 get _pureIsolateTimerFactoryClosure =>
     ((int milliSeconds, void callback(Timer time), bool repeating) =>
         new _PureIsolateTimer(milliSeconds, callback, repeating));