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

editor/util/debuggertest/pets.dart

Index: editor/util/debuggertest/pets.dart
diff --git a/editor/util/debuggertest/pets.dart b/editor/util/debuggertest/pets.dart
index 0d69058a09e63b08257b9d79b44d9fdfce59403a..29c04cce24d1475dc633881e1b6b3430164ec388 100644
--- a/editor/util/debuggertest/pets.dart
+++ b/editor/util/debuggertest/pets.dart
@@ -1,6 +1,8 @@
 
 #library("pets");
 
+#import('dart:math');
+
 final num MAX_CATS = 10;
 
 final SPARKY = const Cat("Sparky");
@@ -52,7 +54,8 @@ class Dog extends FloppyEars implements Animal {
   Date bornOn;
 
   Dog(this.name) {
-    fleaCount = (Math.random() * 10.0).round().toInt();
+    var rand = new Random();
+    fleaCount = rand.nextInt(10);
     bornOn = new Date.now();
   }