Delete pop-pop-win from the repo

samples/pop_pop_win/test/test_util.dart

-// 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.
-library pop_pop_win.test_util;
-
-import 'package:pop_pop_win/src/game.dart';
-
-// This grid
-// XXXXX2
-// X7X8X3
-// X5XXX2
-// X32321
-// 110000
-
-const SAMPLE_FIELD = const
-    [null, null, null, null, null, 2,
-     null,    7, null,    8, null, 3,
-     null,    5, null, null, null, 2,
-     null,    3,    2,    3,    2, 1,
-        1,    1,    0,    0,    0, 0];
-
-
-Field getSampleField() {
-  var bools = new List<bool>.from(SAMPLE_FIELD.map((x) => x == null));
-
-  return new Field.fromSquares(6, 5, bools);
-}