Migrate test block 3 to Dart 2.0.

tests/corelib/bool_hashcode_test.dart

Index: tests/corelib/bool_hashcode_test.dart
diff --git a/tests/corelib/bool_hashcode_test.dart b/tests/corelib/bool_hashcode_test.dart
deleted file mode 100644
index d33b14a05d59e88b215f2ebd99414c669ffb12c0..0000000000000000000000000000000000000000
--- a/tests/corelib/bool_hashcode_test.dart
+++ /dev/null
@@ -1,15 +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";
-
-class BoolHashCodeTest {
-  static testMain() {
-    Expect.notEquals(true.hashCode, false.hashCode);
-  }
-}
-
-main() {
-  BoolHashCodeTest.testMain();
-}