Migrate test block 9 to Dart 2.0

tests/corelib_strong/int_from_environment_test.dart

Index: tests/corelib_strong/int_from_environment_test.dart
diff --git a/tests/corelib_strong/int_from_environment_test.dart b/tests/corelib_strong/int_from_environment_test.dart
deleted file mode 100644
index f6033a5177f4e4f601be8d32324662a869543c51..0000000000000000000000000000000000000000
--- a/tests/corelib_strong/int_from_environment_test.dart
+++ /dev/null
@@ -1,15 +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.
-// SharedOptions=-Da=1 -Db=-12 -Dc=0x123 -Dd=-0x1234 -De=+0x112296 -Df=99999999999999999999
-
-import "package:expect/expect.dart";
-
-main() {
-  Expect.equals(1, const int.fromEnvironment('a'));
-  Expect.equals(-12, const int.fromEnvironment('b'));
-  Expect.equals(0x123, const int.fromEnvironment('c'));
-  Expect.equals(-0x1234, const int.fromEnvironment('d'));
-  Expect.equals(0x112296, const int.fromEnvironment('e'));
-  Expect.equals(99999999999999999999, const int.fromEnvironment('f'));
-}