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

samples/third_party/dromaeo/Dromaeo.dart

Index: samples/third_party/dromaeo/Dromaeo.dart
diff --git a/samples/third_party/dromaeo/Dromaeo.dart b/samples/third_party/dromaeo/Dromaeo.dart
index e9bcf4f89a2116a74f1ed54ddeb3e27e1790c6aa..67642e9663afc416f94e1b791e4c17da40f4d159 100644
--- a/samples/third_party/dromaeo/Dromaeo.dart
+++ b/samples/third_party/dromaeo/Dromaeo.dart
@@ -147,8 +147,8 @@ class Dromaeo {
 
     // TODO(jat): Remove void type below. Bug 5269037.
     void _updateTime() {
-      final mins = (estimatedTimeSecs / 60).floor().toInt();
-      final secs = (estimatedTimeSecs - mins * 60).round().toInt();
+      final mins = (estimatedTimeSecs / 60).floor();
+      final secs = (estimatedTimeSecs - mins * 60).round();
       final secsAsString = '${(secs < 10 ? "0" : "")}$secs';
       _byId('left').innerHtml = '${mins}:${secsAsString}';