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

sdk/lib/core/date.dart

Index: sdk/lib/core/date.dart
diff --git a/sdk/lib/core/date.dart b/sdk/lib/core/date.dart
index d0c0f01d26819194ae0dcc130f6afaa7fe4f96b5..adacbb57a0f1ef034bab5b7439afac1792bb7bc3 100644
--- a/sdk/lib/core/date.dart
+++ b/sdk/lib/core/date.dart
@@ -281,7 +281,7 @@ class _DateImpl implements Date {
       int minute = parseIntOrZero(match[5]);
       int second = parseIntOrZero(match[6]);
       bool addOneMillisecond = false;
-      int millisecond = (parseDoubleOrZero(match[7]) * 1000).round().toInt();
+      int millisecond = (parseDoubleOrZero(match[7]) * 1000).round();
       if (millisecond == 1000) {
         addOneMillisecond = true;
         millisecond = 999;