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

samples/clock/balls.dart

 // 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.
 
 int clientWidth() => window.innerWidth;
 
 int clientHeight() => window.innerHeight;
 
 class Balls {
   static final double RADIUS2 = Ball.RADIUS * Ball.RADIUS;
@@ skipping 100 matching lines @@
 }
 
 class Ball {
   static final double GRAVITY = 400.0;
   static final double RESTITUTION = 0.8;
   static final double MIN_VELOCITY = 100.0;
   static final double INIT_VELOCITY = 800.0;
   static final double RADIUS = 14.0;
 
   static double randomVelocity() {
-    return (Math.random() - 0.5) * INIT_VELOCITY;
+    return (new Math.Random().nextDouble() - 0.5) * INIT_VELOCITY;
   }
 
   Element root;
   ImageElement elem;
   double x, y;
   double vx, vy;
   double ax, ay;
   double age;
 
   Ball(this.root, this.x, this.y, int color) {
@@ skipping 29 matching lines @@
       y = clientHeight().toDouble();
       vy *= -RESTITUTION;
     }
 
     // Position the element.
     setElementPosition(elem, x - RADIUS, y - RADIUS);
 
     return true;
   }
 }