test rename overhaul: step 8 - language tests

tests/language/default_factory_library.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.
 
 // Dart test program for testing default factories defined across libraries
 
 #library("lib");
-#import("DefaultFactoryLibraryTest.dart", prefix:"test");
+#import("default_factory_library_test.dart", prefix:"test");
 
 // References a factory class in another library
 interface A default test.C {
   A();
   int methodA();
 }