Properly fix DirWatcherTest.SubDir on Vista.

base/directory_watcher_win.cc

Index: base/directory_watcher_win.cc
===================================================================
--- base/directory_watcher_win.cc	(revision 6529)
+++ base/directory_watcher_win.cc	(working copy)
@@ -42,12 +42,15 @@
 
 bool DirectoryWatcher::Impl::Watch(const FilePath& path) {
   DCHECK(path_.value().empty());  // Can only watch one path.
+  DCHECK(path.IsAbsolute());  // FindFirstChangeNotification requires it.
 
   handle_ = FindFirstChangeNotification(
       path.value().c_str(),
       FALSE,  // Don't watch subtree.
-      FILE_NOTIFY_CHANGE_FILE_NAME | FILE_NOTIFY_CHANGE_SIZE |
-      FILE_NOTIFY_CHANGE_LAST_WRITE);
+      FILE_NOTIFY_CHANGE_FILE_NAME |
+          FILE_NOTIFY_CHANGE_DIR_NAME |
+          FILE_NOTIFY_CHANGE_SIZE |
+          FILE_NOTIFY_CHANGE_LAST_WRITE);
   if (handle_ == INVALID_HANDLE_VALUE) {
     NOTREACHED();
     return false;