Get rid of all the library tags.

lib/src/hash.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 crypto.hash;
-
 import 'dart:convert';
 
 import 'digest.dart';
 import 'digest_sink.dart';
 
 /// An interface for cryptographic hash functions.
 ///
 /// Every hash is a converter that takes a list of ints and returns a single
 /// digest. When used in chunked mode, it will only ever add one digest to the
 /// inner [Sink].
@@ skipping 38 matching lines @@
 
   /// Finish the hash computation and extract the message digest as a list of
   /// bytes.
   @Deprecated("Expires in 1.0.0. Use Hash.convert() or "
       "Hash.startChunkedConversion() instead.")
   List<int> close() {
     _sink.close();
     return _innerSink.value.bytes;
   }
 }