Fix a regression introduced by r33225....

base/file_util_win.cc

 // 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.
 
 #include "base/file_util.h"
 
 #include <windows.h>
 #include <propvarutil.h>
 #include <shellapi.h>
 #include <shlobj.h>
@@ skipping 510 matching lines @@
       LOG(WARNING) << "CreateDirectory(" << full_path_str << "), " <<
           "conflicts with existing file.";
     }
   }
 
   // Invariant:  Path does not exist as file or directory.
 
   // Attempt to create the parent recursively.  This will immediately return
   // true if it already exists, otherwise will create all required parent
   // directories starting with the highest-level missing parent.
-  if (!CreateDirectory(full_path.DirName())) {
+  FilePath parent_path(full_path.DirName());
+  if (parent_path.value() == full_path.value()) {
+    return false;
+  }
+  if (!CreateDirectory(parent_path)) {
     DLOG(WARNING) << "Failed to create one of the parent directories.";
     return false;
   }
 
   if (!::CreateDirectory(full_path_str, NULL)) {
     DWORD error_code = ::GetLastError();
     if (error_code == ERROR_ALREADY_EXISTS && DirectoryExists(full_path)) {
       // This error code doesn't indicate whether we were racing with someone
       // creating the same directory, or a file with the same path, therefore
       // we check.
@@ skipping 293 matching lines @@
 }
 
 bool HasFileBeenModifiedSince(const FileEnumerator::FindInfo& find_info,
                               const base::Time& cutoff_time) {
   long result = CompareFileTime(&find_info.ftLastWriteTime,
                                 &cutoff_time.ToFileTime());
   return result == 1 || result == 0;
 }
 
 }  // namespace file_util