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

samples/logo/logo.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.
 
 #import('dart:html');
+#import('dart:math', prefix: 'Math');
 
 class Color {
   int hue;
   double saturation;
   double lightness;
 
   Color(int this.hue, double this.saturation, double this.lightness);
 
   factory Color.rgb(double red, double green, double blue) {
     final r = red;
@@ skipping 172 matching lines @@
 
   document.query("input[name=invert]").on.change.add((Event e) {
     InputElement invert = e.target;
     if (invert.checked) {
       logo.classes = ['inverse'];
     } else {
       logo.classes = [];
     }
   });
 }