test rename overhaul: step 8 - language tests

tests/language/src/StringUnicode2NegativeTest.dart

-// 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.
-
-class StringUnicode2NegativeTest {
-
-  static testMain() {
-    // \u{X*} should have 1-6 hex digits
-    String str = "Foo\u{}Bar";
-    str = "Foo\u{000000000}Bar";
-    str = "Foo\u{DEAF!}Bar";
-  }
-}
-
-main() {
-  StringUnicode2NegativeTest.testMain();
-}