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

samples/matrix/matrix_client.dart

Index: samples/matrix/matrix_client.dart
diff --git a/samples/matrix/matrix_client.dart b/samples/matrix/matrix_client.dart
index f5ff43ea068f01aea3972db9fd4ddbfb8d01831e..4ad4228c98d172d27121feec1676e3b80f0edd9e 100644
--- a/samples/matrix/matrix_client.dart
+++ b/samples/matrix/matrix_client.dart
@@ -1,4 +1,4 @@
-// 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.
 
@@ -9,4 +9,5 @@
  */
 #library("matrix");
 #import("dart:dom_deprecated");
+#import("dart:math", prefix: "Math");
 #source("matrix4.dart");