pkg/third_party/html5lib: lots of cleanup

pkg/third_party/html5lib/test/run_all.dart

 #!/usr/bin/env 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 test.run_all;
 
-import 'dart:io' show Options;
 import 'package:unittest/compact_vm_config.dart';
 import 'package:unittest/unittest.dart';
 
 import 'dom_test.dart' as dom_test;
 import 'parser_feature_test.dart' as parser_feature_test;
 import 'parser_test.dart' as parser_test;
 import 'tokenizer_test.dart' as tokenizer_test;
 import 'dom_compat_test.dart' as dom_compat_test;
 
 main(List<String> args) {
   var pattern = new RegExp(args.length > 0 ? args[0] : '.');
   useCompactVMConfiguration();
 
   void addGroup(testFile, testMain) {
     if (pattern.hasMatch(testFile)) {
       group(testFile.replaceAll('_test.dart', ':'), testMain);
     }
   }
 
   addGroup('dom_test.dart', dom_test.main);
   addGroup('dom_compat_test.dart', dom_compat_test.main);
   addGroup('parser_feature_test.dart', parser_feature_test.main);
   addGroup('parser_test.dart', parser_test.main);
   addGroup('tokenizer_test.dart', tokenizer_test.main);
 }