Migrate test block 30 + corelib portion of block 31 to Dart 2.0.

tests/corelib_strong/unicode_test.dart

Index: tests/corelib_strong/unicode_test.dart
diff --git a/tests/corelib_strong/unicode_test.dart b/tests/corelib_strong/unicode_test.dart
deleted file mode 100644
index 8b02913158930c400f52fb190ef12280105b60a0..0000000000000000000000000000000000000000
--- a/tests/corelib_strong/unicode_test.dart
+++ /dev/null
@@ -1,16 +0,0 @@
-// Copyright (c) 2011, 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 UnicodeTest {
-  static testMain() {
-    var lowerStrasse = new String.fromCharCodes([115, 116, 114, 97, 223, 101]);
-    Expect.equals("STRASSE", lowerStrasse.toUpperCase());
-  }
-}
-
-main() {
-  UnicodeTest.testMain();
-}