Migrate test block 10 to Dart 2.0.

tests/corelib/iterable_first_test.dart

Index: tests/corelib/iterable_first_test.dart
diff --git a/tests/corelib/iterable_first_test.dart b/tests/corelib/iterable_first_test.dart
deleted file mode 100644
index 8e3e7c8c9eb82afdf9427f1043b8d16bfb3207ea..0000000000000000000000000000000000000000
--- a/tests/corelib/iterable_first_test.dart
+++ /dev/null
@@ -1,22 +0,0 @@
-// Copyright (c) 2012, 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.
-
-import "package:expect/expect.dart";
-
-main() {
-  List<int> list1 = <int>[1, 2, 3];
-  List<int> list2 = const <int>[4, 5];
-  List<String> list3 = <String>[];
-  Set<int> set1 = new Set<int>();
-  set1..add(11)..add(12)..add(13);
-  Set set2 = new Set();
-
-  Expect.equals(1, list1.first);
-  Expect.equals(4, list2.first);
-  Expect.throws(() => list3.first, (e) => e is StateError);
-
-  Expect.isTrue(set1.contains(set1.first));
-
-  Expect.throws(() => set2.first, (e) => e is StateError);
-}