Get rid of all the library tags.

lib/src/util/one_off_handler.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.util.one_off_handler;
-
 import 'package:path/path.dart' as p;
 import 'package:shelf/shelf.dart' as shelf;
 
 /// A Shelf handler that provides support for one-time handlers.
 ///
 /// This is useful for handlers that only expect to be hit once before becoming
 /// invalid and don't need to have a persistent URL.
 class OneOffHandler {
   /// A map from URL paths to handlers.
   final _handlers = new Map<String, shelf.Handler>();
@@ skipping 21 matching lines @@
   _onRequest(shelf.Request request) {
     var components = p.url.split(request.url.path);
     if (components.isEmpty) return new shelf.Response.notFound(null);
 
     var path = components.removeAt(0);
     var handler = _handlers.remove(path);
     if (handler == null) return new shelf.Response.notFound(null);
     return handler(request.change(path: path));
   }
 }