test rename overhaul: step 8 - language tests

tests/language/interface_factory_constructor_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.
 
 interface A {
   factory A();
 }
 
 class InterfaceFactoryConstructorNegativeTest {
 
   static testMain() {
   }
 }
 
 main() {
   InterfaceFactoryConstructorNegativeTest.testMain();
 }