Delete pop-pop-win from the repo

samples/pop_pop_win/lib/src/game/square_state.dart

Index: samples/pop_pop_win/lib/src/game/square_state.dart
diff --git a/samples/pop_pop_win/lib/src/game/square_state.dart b/samples/pop_pop_win/lib/src/game/square_state.dart
deleted file mode 100644
index efd2467ff46d100f2b5fcde0d6e6a2d01863b057..0000000000000000000000000000000000000000
--- a/samples/pop_pop_win/lib/src/game/square_state.dart
+++ /dev/null
@@ -1,17 +0,0 @@
-// Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-part of pop_pop_win.game;
-
-class SquareState {
-  static const SquareState hidden = const SquareState._internal("hidden");
-  static const SquareState revealed = const SquareState._internal("revealed");
-  static const SquareState flagged = const SquareState._internal("flagged");
-  static const SquareState bomb = const SquareState._internal("bomb");
-  static const SquareState safe = const SquareState._internal('safe');
-  final String name;
-
-  const SquareState._internal(this.name);
-
-  String toString() => 'SquareState: $name';
-}