Format all multitests

tests/language_strong/built_in_identifier_illegal_test.dart

 // Copyright (c) 2012, 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.
 // Check that we cannot use a pseudo keyword at the class level code.
 
 // Pseudo keywords are not allowed to be used as class names.
 class abstract { } //   //# 01: compile-time error
 class as { } //         //# 19: compile-time error
 class dynamic { } //    //# 04: compile-time error
 class export { } //     //# 17: compile-time error
 class external { } //   //# 20: compile-time error
 class factory { } //    //# 05: compile-time error
 class get { } //        //# 06: compile-time error
 class implements { } // //# 07: compile-time error
 class import { } //     //# 08: compile-time error
 class library { } //    //# 10: compile-time error
 class operator { } //   //# 12: compile-time error
 class part { } //       //# 18: compile-time error
 class set { } //        //# 13: compile-time error
 class static { } //     //# 15: compile-time error
 class typedef { } //    //# 16: compile-time error
 
-
-main() { }
+main() {}