Deprecate Math object in corelib in favor of dart:math library.

pkg/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, week name, field order, etc.
@@ skipping 147 matching lines @@
  * fails to parse "1234". In other words, the leftmost field of the run is
  * flexible, while the others keep a fixed width. If the parse fails anywhere in
  * the run, then the leftmost field is shortened by one character, and the
  * entire run is parsed again. This is repeated until either the parse succeeds
  * or the leftmost field is one character in length. If the parse still fails at
  * that point, the parse of the run fails.
  */
 
 #library('date_format');
 
+#import('dart:math');
+
 #import('intl.dart');
 #import('date_time_patterns.dart');
 #import('date_symbols.dart');
 #import('date_symbol_data.dart');
 
 #source('lib/date_format_field.dart');
 #source('lib/date_format_helpers.dart');
 
 class DateFormat {
 
@@ skipping 342 matching lines @@
   /** Polyfill for missing library function. */
   List _reverse(List list) {
     // TODO(alanknight): Use standardized list reverse when implemented.
     // See Issue 2804.
     var result = new List();
     for (var i = list.length-1; i >= 0; i--) {
       result.addLast(list[i]);
     }
     return result;
   }
-}
+}