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

utils/css/css.dart

Index: utils/css/css.dart
diff --git a/utils/css/css.dart b/utils/css/css.dart
index 34b4eb370b638bb96e888baab79242a6446e9b02..a0d4e826f15d2babe1b5d5aa052e49ad749a7334 100644
--- a/utils/css/css.dart
+++ b/utils/css/css.dart
@@ -1,9 +1,10 @@
-// Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
+// 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.
 
 #library('css');
 
+#import('dart:math', prefix: 'Math');
 #import("../lib/file_system.dart");
 #import('../lib/file_system_memory.dart');