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

tests/language/closure_type_test.dart

Index: tests/language/closure_type_test.dart
diff --git a/tests/language/closure_type_test.dart b/tests/language/closure_type_test.dart
index 499e75b942b66a1cd7465ccb0e2182a75db0f1bb..3438d201e922cfc61e484637c0d1c0ab0cc4b3ae 100644
--- a/tests/language/closure_type_test.dart
+++ b/tests/language/closure_type_test.dart
@@ -4,6 +4,13 @@
 // Dart test for a closure result type test that cannot be eliminated at compile
 // time.
 
+#library('closure_type_test');
+#import('dart:math', prefix: 'math');
+
+class Math {
+  static int sqrt(x) => math.sqrt(x);
+}
+
 isCheckedMode() {
   try {
     var i = 1;
@@ -35,4 +42,4 @@ void test(int func(int value), int value) {
 
 root(x) => Math.sqrt(x);
 
-main() => test(root, 4);
+main() => test(root, 4);