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

samples/dartcombat/dartcombatlib.dart

Index: samples/dartcombat/dartcombatlib.dart
diff --git a/samples/dartcombat/dartcombatlib.dart b/samples/dartcombat/dartcombatlib.dart
index 72ca28bdc4a4c442d7f15c91fdb46fcfa820ee0c..71537f62e8407cd20c47f43b0ca53e49adb68527 100644
--- a/samples/dartcombat/dartcombatlib.dart
+++ b/samples/dartcombat/dartcombatlib.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.
 
@@ -6,6 +6,7 @@
 
 #import('dart:isolate');
 #import('dart:html');
+#import('dart:math', prefix: 'Math');
 
 #source('setup.dart');
 #source('grids.dart');