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

samples/ui_lib/layout/layout.dart

Index: samples/ui_lib/layout/layout.dart
diff --git a/samples/ui_lib/layout/layout.dart b/samples/ui_lib/layout/layout.dart
index bd294161850abd234da36065c9f6d5089ca195b6..f3599fb4019aa7a84c22cc0dfdb1524391523ce1 100644
--- a/samples/ui_lib/layout/layout.dart
+++ b/samples/ui_lib/layout/layout.dart
@@ -1,10 +1,12 @@
-// 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('layout.dart');
 
 #import('dart:html');
+#import('dart:math', prefix: 'Math');
+
 #import('../base/base.dart');
 #import('../util/utilslib.dart');