Get rid of all the library tags.

lib/src/runner/application_exception.dart

 // Copyright (c) 2015, 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.
 
-library test.runner.application_exception;
-
 /// An expected exception caused by user-controllable circumstances.
 class ApplicationException implements Exception {
   final String message;
 
   ApplicationException(this.message);
 
   String toString() => message;
 }