Get rid of all the library tags.

lib/src/case_insensitive_map.dart

 // Copyright (c) 2015, 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 http_parser.case_insensitive_map;
-
 import 'package:collection/collection.dart';
 
 /// A map from case-insensitive strings to values.
 ///
 /// Much of HTTP is case-insensitive, so this is useful to have pre-defined.
 class CaseInsensitiveMap<V> extends CanonicalizedMap<String, String, V> {
   CaseInsensitiveMap()
       : super((key) => key.toLowerCase(), isValidKey: (key) => key != null);
 
   CaseInsensitiveMap.from(Map<String, V> other)
       : super.from(other, (key) => key.toLowerCase(),
             isValidKey: (key) => key != null);
 }