Migrate test block 9 to Dart 2.0

tests/corelib/int_from_environment3_test.dart

Index: tests/corelib/int_from_environment3_test.dart
diff --git a/tests/corelib/int_from_environment3_test.dart b/tests/corelib/int_from_environment3_test.dart
deleted file mode 100644
index 996338a2593297987160417a2ab0e1450532485d..0000000000000000000000000000000000000000
--- a/tests/corelib/int_from_environment3_test.dart
+++ /dev/null
@@ -1,11 +0,0 @@
-// Copyright (c) 2013, 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.
-
-main() {
-  const int.fromEnvironment('NOT_FOUND', defaultValue: ''); // //# 01: compile-time error
-  const int.fromEnvironment('NOT_FOUND', defaultValue: true); // //# 02: compile-time error
-  const int.fromEnvironment(null); // //# 03: compile-time error
-  const int.fromEnvironment(1); // //# 04: compile-time error
-  const int.fromEnvironment([]); // //# 05: compile-time error
-}