Get rid of all the library tags.

lib/src/source.dart

 // Copyright (c) 2012, 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;
-
 import 'dart:async';
 
 import 'package:pub_semver/pub_semver.dart';
 
 import 'package.dart';
 import 'pubspec.dart';
 import 'system_cache.dart';
 import 'utils.dart';
 
 /// A source from which to get packages.
@@ skipping 209 matching lines @@
   /// Stores [pubspec] so it's returned when [describe] is called with [id].
   ///
   /// This is notionally protected; it should only be called by subclasses.
   void memoizePubspec(PackageId id, Pubspec pubspec) {
     _pubspecs[id] = pubspec;
   }
 
   /// Returns the source's name.
   String toString() => name;
 }