Get rid of all the library tags.

lib/src/asset/dart/serialize/exception.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.exception;
-
 import 'package:barback/barback.dart';
 import 'package:stack_trace/stack_trace.dart';
 
 import '../utils.dart';
 
 /// An exception that was originally raised in another isolate.
 ///
 /// Exception objects can't cross isolate boundaries in general, so this class
 /// wraps as much information as can be consistently serialized.
 class CrossIsolateException implements Exception {
@@ skipping 76 matching lines @@
 ///
 /// This handles [AssetNotFoundException]s specially, ensuring that their
 /// metadata is preserved.
 CrossIsolateException deserializeException(Map error) {
   if (error['type'] == 'AssetNotFoundException') {
     return new _CrossIsolateAssetNotFoundException.deserialize(error);
   } else {
     return new CrossIsolateException.deserialize(error);
   }
 }