samples/poppopwin: upgrade to first-class sample

samples/third_party/pop-pop-win/lib/src/html/high_score_view.dart

Index: samples/third_party/pop-pop-win/lib/src/html/high_score_view.dart
diff --git a/samples/third_party/pop-pop-win/lib/src/html/high_score_view.dart b/samples/third_party/pop-pop-win/lib/src/html/high_score_view.dart
deleted file mode 100644
index 43f3351847adcea68e3f4bebd35449fd57eadf2c..0000000000000000000000000000000000000000
--- a/samples/third_party/pop-pop-win/lib/src/html/high_score_view.dart
+++ /dev/null
@@ -1,27 +0,0 @@
-part of ppw_html;
-
-class HighScoreView {
-  final DivElement _div;
-  final GameManager _manager;
-
-  HighScoreView(this._manager, this._div) {
-    assert(_div != null);
-    assert(_manager != null);
-
-    _manager.bestTimeUpdated.listen((args) => _update());
-
-    _update();
-  }
-
-  void _update() {
-    _manager.bestTimeMilliseconds
-      .then((int milliseconds) {
-        if(milliseconds != null) {
-          final duration = new Duration(seconds: milliseconds ~/ 1000);
-          _div.innerHtml = duration.toString();
-        } else {
-          _div.innerHtml = '';
-        }
-      });
-  }
-}