Get rid of all the library tags.

lib/src/backend/platform_selector/token.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 test.backend.platform_selector.token;
-
 import 'package:source_span/source_span.dart';
 
 /// A token in a platform selector.
 class Token {
   /// The type of the token.
   final TokenType type;
 
   /// The span indicating where this token came from.
   ///
   /// This is a [FileSpan] because the tokens are parsed from a single
@@ skipping 46 matching lines @@
   /// The end of the selector.
   static const endOfFile = const TokenType._("end of file");
 
   /// The name of the token type.
   final String name;
 
   const TokenType._(this.name);
 
   String toString() => name;
 }