test rename overhaul: step 8 - language tests

tests/language/src/Prefix3NegativeTest.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.
-//
-
-// Using the same prefix name while importing two different libraries is
-// not an error but both library1.dart and library2.dart define 'foo' which
-// results in a duplicate definition error.
-#library("Prefix3NegativeTest.dart");
-#import("library1.dart", prefix: "lib2");  // defines 'foo'.
-#import("library2.dart", prefix: "lib2");  // also defines 'foo'.
-
-class Prefix3NegativeTest {
-  static Main() {
-  }
-}
-
-main() {
-  Prefix3NegativeTest.Main();
-}