pkg/test: cleanup imports

lib/src/runner/configuration/args.dart

 // Copyright (c) 2016, 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:io';
 
 import 'package:args/args.dart';
 
+import '../../backend/test_platform.dart';
 import '../../frontend/timeout.dart';
-import '../../backend/test_platform.dart';
 import '../../utils.dart';
 import '../configuration.dart';
 import 'values.dart';
 
 /// The parser used to parse the command-line arguments.
 final ArgParser _parser = (() {
   var parser = new ArgParser(allowTrailingOptions: true);
 
   var allPlatforms = TestPlatform.all.toList();
   if (!Platform.isMacOS) allPlatforms.remove(TestPlatform.safari);
@@ skipping 147 matching lines @@
   var value = options[name];
   if (value == null) return null;
 
   try {
     return parse(value);
   } on FormatException catch (error) {
     throw new FormatException('Couldn\'t parse --$name "${options[name]}": '
         '${error.message}');
   }
 }