Get rid of all the library tags.

lib/src/asset/dart/serialize.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.asset.serialize;
-
 import 'dart:async';
 import 'dart:isolate';
 
 import 'package:barback/barback.dart';
 
 //# if source_span
 import 'package:source_span/source_span.dart';
 //# end
 
 import 'serialize/exception.dart';
@@ skipping 143 matching lines @@
   var replyTo = wrappedMessage['replyTo'];
   new Future.sync(() => callback(wrappedMessage['message']))
       .then((result) => replyTo.send({'type': 'success', 'value': result}))
       .catchError((error, stackTrace) {
     replyTo.send({
       'type': 'error',
       'error': serializeException(error, stackTrace)
     });
   });
 }