Get rid of all the library tags.

test/utils.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 stack_trace.test.utils;
-
 import 'package:test/test.dart';
 
 /// Returns a matcher that runs [matcher] against a [Frame]'s `member` field.
 Matcher frameMember(matcher) =>
   transform((frame) => frame.member, matcher, 'member');
 
 /// Returns a matcher that runs [matcher] against a [Frame]'s `library` field.
 Matcher frameLibrary(matcher) =>
   transform((frame) => frame.library, matcher, 'library');
 
@@ skipping 11 matching lines @@
   final String _description;
 
   _TransformMatcher(this._transformation, this._matcher, this._description);
 
   bool matches(item, Map matchState) =>
     _matcher.matches(_transformation(item), matchState);
 
   Description describe(Description description) =>
     description.add(_description).add(' ').addDescriptionOf(_matcher);
 }