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

samples/ui_lib/touch/touch.dart

-// 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('touch');
 
+#import('dart:coreimpl');
 #import('dart:html');
-#import('dart:coreimpl');
+#import('dart:math', prefix: 'Math');
+
 #import('../base/base.dart');
 #import('../util/utilslib.dart');
 
 #source('BezierPhysics.dart');
 #source('FxUtil.dart');
 #source('InfiniteScroller.dart');
 #source('Momentum.dart');
 #source('Scroller.dart');
 #source('TouchHandler.dart');
 #source('ClickBuster.dart');
 #source('EventUtil.dart');
 #source('Geometry.dart');
 #source('Math.dart');
 #source('Scrollbar.dart');
 #source('ScrollWatcher.dart');
 #source('TimeUtil.dart');
 #source('TouchUtil.dart');