test rename overhaul: step 8 - language tests

tests/language/script_negative_test.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.
 
 // Imported library does not start with a library tag.
 
 #library("ScriptNegativeTest.dart");
-#import("ScriptNegativeLib.dart");
+#import("script_negative_lib.dart");
 
 main() {
   print("Should not reach here.");
 }