pkg/test: cleanup imports

lib/src/runner/configuration.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.
 
 import 'dart:io';
 
 import 'package:collection/collection.dart';
 import 'package:glob/glob.dart';
 import 'package:path/path.dart' as p;
 
-import '../frontend/timeout.dart';
 import '../backend/metadata.dart';
 import '../backend/test_platform.dart';
+import '../frontend/timeout.dart';
 import '../util/io.dart';
 import '../utils.dart';
 import 'configuration/args.dart' as args;
 import 'configuration/load.dart';
 import 'configuration/values.dart';
 
 /// A class that encapsulates the command-line configuration of the test runner.
 class Configuration {
   /// The usage string for the command-line arguments.
   static String get usage => args.usage;
@@ skipping 188 matching lines @@
         pattern: other.pattern ?? pattern,
         platforms: other._platforms ?? _platforms,
         paths: other._paths ?? _paths,
         filename: other._filename ?? _filename,
         includeTags: other.includeTags.union(includeTags),
         excludeTags: other.excludeTags.union(excludeTags),
         tags: mergeMaps(tags, other.tags,
             value: (config1, config2) => config1.merge(config2)));
   }
 }