Make ~/, round, ceil, floor, truncate return ints. Remove toInt.

samples/third_party/dromaeo/common/Math2.dart

Index: samples/third_party/dromaeo/common/Math2.dart
diff --git a/samples/third_party/dromaeo/common/Math2.dart b/samples/third_party/dromaeo/common/Math2.dart
index 6f713d800b793402ef3fd72c7b3db8dd9416122a..20f08faeab099f799aab687945332c6b05143f5a 100644
--- a/samples/third_party/dromaeo/common/Math2.dart
+++ b/samples/third_party/dromaeo/common/Math2.dart
@@ -27,11 +27,11 @@ class Math2 {
   }
 
   static int round(double d) {
-    return d.round().toInt();
+    return d.round();
   }
 
   static int floor(double d) {
-    return d.floor().toInt();
+    return d.floor();
   }
 
   // TODO (olonho): use d.toStringAsFixed(precision) when implemented by DartVM