Get rid of all the library tags.

lib/src/solver/version_queue.dart

 // Copyright (c) 2013, 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 pub.solver.version_queue;
-
 import 'dart:async';
 import 'dart:collection' show Queue;
 
 import '../package.dart';
 
 /// A function that asynchronously returns a sequence of package IDs.
 typedef Future<Iterable<PackageId>> PackageIdGenerator();
 
 /// A prioritized, asynchronous queue of the possible versions that can be
 /// selected for one package.
@@ skipping 79 matching lines @@
     _hasFailed = true;
   }
 
   /// Determines the list of allowed versions matching its constraint and places
   /// them in [_allowed].
   Future _calculateAllowed() async {
     var allowed = await _allowedGenerator();
     _allowed = new Queue<PackageId>.from(allowed);
   }
 }