Get rid of all the library tags.

lib/src/barback/transformer_isolate.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.transformer_isolate;
-
 import 'dart:async';
 import 'dart:convert';
 import 'dart:isolate';
 
 import 'package:barback/barback.dart';
 import 'package:source_span/source_span.dart';
 import 'package:stack_trace/stack_trace.dart';
 
 import '../asset/dart/serialize.dart';
 import '../barback.dart';
@@ skipping 118 matching lines @@
 /// An error thrown when a transformer fails to load.
 class TransformerLoadError extends SourceSpanException
     implements WrappedException {
   final CrossIsolateException innerError;
   Chain get innerChain => innerError.stackTrace;
 
   TransformerLoadError(CrossIsolateException error, SourceSpan span)
       : innerError = error,
         super("Error loading transformer: ${error.message}", span);
 }