Make pub strong-mode clean.

lib/src/command_runner.dart

 // Copyright (c) 2014, 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.
 
 import 'dart:async';
 import 'dart:io';
 
 import 'package:args/args.dart';
 import 'package:args/command_runner.dart';
 import 'package:http/http.dart' as http;
@@ skipping 61 matching lines @@
     addCommand(new GetCommand());
     addCommand(new ListPackageDirsCommand());
     addCommand(new LishCommand());
     addCommand(new RunCommand());
     addCommand(new ServeCommand());
     addCommand(new UpgradeCommand());
     addCommand(new UploaderCommand());
     addCommand(new VersionCommand());
   }
 
-  Future run(List<String> arguments) async {
+  Future run(Iterable<String> arguments) async {
     var options;
     try {
       options = super.parse(arguments);
     } on UsageException catch (error) {
       log.exception(error);
       await flushThenExit(exit_codes.USAGE);
     }
     await runCommand(options);
   }
 
@@ skipping 123 matching lines @@
   Future _validatePlatform() async {
     if (Platform.operatingSystem != 'windows') return;
 
     var result = await runProcess('ver', []);
     if (result.stdout.join('\n').contains('XP')) {
       log.error('Sorry, but pub is not supported on Windows XP.');
       await flushThenExit(exit_codes.USAGE);
     }
   }
 }