Get rid of all the library tags.

lib/src/solver/version_selection.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 pub.solver.version_selection;
-
 import 'dart:async';
 import 'dart:collection';
 
 import 'package:pub_semver/pub_semver.dart';
 
 import '../package.dart';
 import 'backtracking_solver.dart';
 import 'unselected_package_queue.dart';
 import 'version_solver.dart';
 
@@ skipping 107 matching lines @@
   /// Returns a string description of the dependencies on [name].
   String describeDependencies(String name) =>
       getDependenciesOn(name).map((dep) => "  $dep").join('\n');
 
   /// Gets the list of known dependencies on package [name].
   ///
   /// Creates an empty list if needed.
   List<Dependency> getDependenciesOn(String name) =>
       _dependencies.putIfAbsent(name, () => <Dependency>[]);
 }