Get rid of all the library tags.

lib/src/source/cached.dart

 // Copyright (c) 2014, 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.source.cached;
-
 import 'dart:async';
 
 import 'package:path/path.dart' as path;
 
 import '../io.dart';
 import '../package.dart';
 import '../pubspec.dart';
 import '../source.dart';
 import '../utils.dart';
 
@@ skipping 46 matching lines @@
   List<Package> getCachedPackages();
 
   /// Reinstalls all packages that have been previously installed into the
   /// system cache by this source.
   ///
   /// Returns a [Pair] whose first element is the packages that were
   /// successfully repaired and the second is the packages that failed to be
   /// repaired.
   Future<Pair<List<PackageId>, List<PackageId>>> repairCachedPackages();
 }