Migrate test block 8 to Dart 2.0.

tests/corelib_strong/from_environment_const_type_undefined_test.dart

Index: tests/corelib_strong/from_environment_const_type_undefined_test.dart
diff --git a/tests/corelib_strong/from_environment_const_type_undefined_test.dart b/tests/corelib_strong/from_environment_const_type_undefined_test.dart
deleted file mode 100644
index 076fa7e144cfd776117d24b27d3f606b601d2607..0000000000000000000000000000000000000000
--- a/tests/corelib_strong/from_environment_const_type_undefined_test.dart
+++ /dev/null
@@ -1,42 +0,0 @@
-// 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.
-
-import "package:expect/expect.dart";
-
-class Foo {}
-
-const
-    bool //  //# 01: ok
-    int //   //# 02: static type warning, checked mode compile-time error
-    String //# 03: static type warning, checked mode compile-time error
-    Foo //   //# 04: static type warning, checked mode compile-time error
-    a = const bool.fromEnvironment('a');
-
-const
-    bool //  //# 05: ok
-    int //   //# 06: static type warning, checked mode compile-time error
-    String //# 07: static type warning, checked mode compile-time error
-    Foo //   //# 08: static type warning, checked mode compile-time error
-    b = const bool.fromEnvironment('b');
-
-const
-    bool //  //# 09: static type warning
-    int //   //# 10: ok
-    String //# 11: static type warning
-    Foo //   //# 12: static type warning
-    c = const int.fromEnvironment('c');
-
-const
-    bool //  //# 13: static type warning
-    int //   //# 14: static type warning
-    String //# 15: ok
-    Foo //   //# 16: static type warning
-    d = const String.fromEnvironment('d');
-
-main() {
-  Expect.equals(a, false);
-  Expect.equals(b, false);
-  Expect.equals(c, null);
-  Expect.equals(d, null);
-}