Remove deprecated classes and functions in Date.

lib/i18n/date_format.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.
  *
  * DateFormat is for formatting and parsing dates in a locale-sensitive 
  * manner. 
  * It allows the user to choose from a set of standard date time formats as well
  * as specify a customized pattern under certain locales. Date elements that
  * vary across locales include month name, weekname, field, order, etc.
@@ skipping 209 matching lines @@
    * format.
    */
   String parse(String inputString) {
     return inputString;
   }
 
  /**
   * Format the given [date] object according to preset pattern and current 
   * locale and return a formated string for the given date.
   */
-  String format(Date date, [TimeZone timeZone]) {
-    // TODO(efortuna): optional TimeZone argument? TimeZone is deprecated...
+  String format(Date date) {
+    // TODO(efortuna): readd optional TimeZone argument (or similar)?
     return date.toString();
   }
 
   /**
    * Returns a date string indicating how long ago (3 hours, 2 minutes)
    * something has happened or how long in the future something will happen
    * given a [reference] Date relative to the current time.
    */
   String formatDuration(Date reference) {
     return '';
   }
   
   /**
    * Formats a String indicating how long ago (negative [duration]) or how far
    * in the future (positive [duration]) some time is with respect to a
    * reference [date]. The [duration] is expressed in miliseconds.
    */
   String formatDurationFrom(num duration, Date date) {
     return '';
   }
 }