Update all Angular libs (run update_all.sh).

third_party/pkg/js/lib/src/wrapping/js/date_to_datetime_adapter.dart

Index: third_party/pkg/js/lib/src/wrapping/js/date_to_datetime_adapter.dart
diff --git a/third_party/pkg/js/lib/src/wrapping/js/date_to_datetime_adapter.dart b/third_party/pkg/js/lib/src/wrapping/js/date_to_datetime_adapter.dart
index 2211c45a2c7d81c59a7070b646ab5f6160b48ab1..9c74af3094f056f7dd95772eadf78dccfdb36f3d 100644
--- a/third_party/pkg/js/lib/src/wrapping/js/date_to_datetime_adapter.dart
+++ b/third_party/pkg/js/lib/src/wrapping/js/date_to_datetime_adapter.dart
@@ -43,10 +43,9 @@ class JsDateToDateTimeAdapter extends TypedProxy implements DateTime {
   @override int get weekday => _asDateTime().weekday;
   @override int get millisecondsSinceEpoch =>
       _asDateTime().millisecondsSinceEpoch;
-  @override void set millisecondsSinceEpoch(v) => throw "final";
   @override bool get isUtc => _asDateTime().isUtc;
-  @override void set isUtc(v) => throw "final";
   @override String toString() => _asDateTime().toString();
+  @override String toIso8601String() => _asDateTime().toIso8601String();
   @override DateTime add(Duration duration) => _asDateTime().add(duration);
   @override DateTime subtract(Duration duration) =>
       _asDateTime().subtract(duration);
@@ -55,4 +54,5 @@ class JsDateToDateTimeAdapter extends TypedProxy implements DateTime {
 
   DateTime _asDateTime() =>
       new DateTime.fromMillisecondsSinceEpoch($unsafe.getTime());
+
 }