Properly fix DirWatcherTest.SubDir on Vista.

base/directory_watcher.h

 // Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // This module provides a way to monitor a directory for changes.
 
 #ifndef BASE_DIRECTORY_WATCHER_H_
 #define BASE_DIRECTORY_WATCHER_H_
 
 #include <string>
 #include "base/basictypes.h"
 #include "base/ref_counted.h"
 
 class FilePath;
 
 // This class lets you register interest in changes on a directory.
-// The delegate will get called whenever a file is added or changed in the
-// directory.
+// The delegate will get called whenever a file is added, deleted,
+// renamed or modified in the directory, and also when a directory
+// is created, deleted or renamed in the directory. Does not watch
+// subdirectories.
 class DirectoryWatcher {
  public:
   class Delegate {
    public:
     virtual void OnDirectoryChanged(const FilePath& path) = 0;
   };
 
   DirectoryWatcher();
   ~DirectoryWatcher();
 
   // Register interest in any changes in the directory |path|.
   // OnDirectoryChanged will be called back for each change within the dir.
   // Returns false on error.
   bool Watch(const FilePath& path, Delegate* delegate);
 
  private:
   class Impl;
   friend class Impl;
   scoped_refptr<Impl> impl_;
 
   DISALLOW_COPY_AND_ASSIGN(DirectoryWatcher);
 };
 
 #endif  // BASE_DIRECTORY_WATCHER_H_