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

tests/language/intrinsified_methods_test.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.
 // Dart test program for testing the instanceof operation.
 
+#library('intrinsified_methods_test');
+#import('dart:math');
 
 testIsNegative() {
   Expect.isFalse((12.0).isNegative());
   Expect.isTrue((-12.0).isNegative());
   Expect.isFalse((double.NAN).isNegative());
   Expect.isFalse((0.0).isNegative());
   Expect.isTrue((-0.0).isNegative());
   Expect.isFalse((double.INFINITY).isNegative());
   Expect.isTrue((double.NEGATIVE_INFINITY).isNegative());
 }
 
 testIsNaN() {
   Expect.isFalse((1.0).isNaN());
   Expect.isTrue((double.NAN).isNaN());
 }
 
 
 testTrigonometric() {
-  Expect.approxEquals(1.0, Math.sin(Math.PI / 2.0), 0.0001);
-  Expect.approxEquals(1.0, Math.cos(0), 0.0001);
-  Expect.approxEquals(1.0, Math.cos(0.0), 0.0001);
+  Expect.approxEquals(1.0, sin(PI / 2.0), 0.0001);
+  Expect.approxEquals(1.0, cos(0), 0.0001);
+  Expect.approxEquals(1.0, cos(0.0), 0.0001);
 }
 
 num foo(int n) {
   var x;
   for(var i = 0; i <= n; ++i) {
-    Expect.equals(2.0, Math.sqrt(4.0));
+    Expect.equals(2.0, sqrt(4.0));
     testIsNegative();
     testIsNaN();
     testTrigonometric();
   }
   return x;
 }
 
 void main() {
   var m = foo(4000);
 }