Get rid of all the library tags.

lib/src/package_graph.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.package_graph;
-
 import 'barback/transformer_cache.dart';
 import 'entrypoint.dart';
 import 'lock_file.dart';
 import 'package.dart';
 import 'solver/version_solver.dart';
 import 'source/cached.dart';
 import 'utils.dart';
 
 /// A holistic view of the entire transitive dependency graph for an entrypoint.
 class PackageGraph {
@@ skipping 135 matching lines @@
   bool isPackageStatic(String package) {
     var id = lockFile.packages[package];
     if (id == null) return false;
 
     var source = entrypoint.cache.sources[id.source];
     if (source is! CachedSource) return false;
 
     return packages[package].pubspec.transformers.isEmpty;
   }
 }