Possible fix for Windows bot failures

pkg/analysis_server/test/context_manager_test.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.
 
 library test.context.directory.manager;
 
 import 'dart:collection';
 
 import 'package:analysis_server/src/context_manager.dart';
 import 'package:analyzer/file_system/file_system.dart';
@@ skipping 1325 matching lines @@
     callbacks.assertContextFiles(subProject, [subFile]);
     // delete the pubspec
     resourceProvider.deleteFile(subPubspec);
     return pumpEventQueue().then((_) {
       callbacks.assertContextPaths([root]);
       callbacks.assertContextFiles(root, [rootFile, subFile]);
     });
   }
 
   test_watch_deletePackagespec_fromSubFolder_withPubspec() {
-    // prepare paths
+    // prepare paths:
+    //
+    // root
+    //   root.dart
+    //   sub
+    //     aaa
+    //       .packages
+    //       pubspec.yaml
+    //       bin
+    //         a.dart
+    //
     String root = '/root';
     String rootFile = '$root/root.dart';
     String subProject = '$root/sub/aaa';
     String subPackagespec = '$subProject/.packages';
     String subPubspec = '$subProject/pubspec.yaml';
     String subFile = '$subProject/bin/a.dart';
     // create files
     resourceProvider.newFile(subPackagespec, '');
     resourceProvider.newFile(subPubspec, 'pubspec');
     resourceProvider.newFile(rootFile, 'library root;');
@@ skipping 312 matching lines @@
 class TestUriResolver extends UriResolver {
   Map<Uri, Source> uriMap;
 
   TestUriResolver(this.uriMap);
 
   @override
   Source resolveAbsolute(Uri uri, [Uri actualUri]) {
     return uriMap[uri];
   }
 }