Get rid of all the library tags.

lib/src/authorization_code_grant.dart

 // Copyright (c) 2012, 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 oauth2.authorization_code_grant;
-
 import 'dart:async';
 
 import 'package:http/http.dart' as http;
 
 import 'client.dart';
 import 'authorization_exception.dart';
 import 'handle_access_token_response.dart';
 import 'utils.dart';
 
 /// A class for obtaining credentials via an [authorization code grant][].
@@ skipping 281 matching lines @@
   // [AuthorizationCodeGrant.handleAuthorizationResponse] or
   // [AuthorizationCodeGrant.handleAuthorizationCode] have been called.
   static const finished = const _State("finished");
 
   final String _name;
 
   const _State(this._name);
 
   String toString() => _name;
 }