Don't save last used locations in open and save dialogs when in incognito mode.

chrome/browser/download/save_package.cc

 // Copyright (c) 2010 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 "chrome/browser/download/save_package.h"
 
 #include "app/l10n_util.h"
 #include "base/file_path.h"
 #include "base/file_util.h"
 #include "base/i18n/file_util_icu.h"
@@ skipping 1250 matching lines @@
 
   // The option index is not zero-based.
   DCHECK(index > 0 && index < 3);
   param->dir = param->saved_main_file_path.DirName();
 
   PrefService* prefs = tab_contents_->profile()->GetPrefs();
   StringPrefMember save_file_path;
   save_file_path.Init(prefs::kSaveFileDefaultDirectory, prefs, NULL);
   // If user change the default saving directory, we will remember it just
   // like IE and FireFox.
-  if (save_file_path.GetValue() != param->dir.ToWStringHack())
+  if (!tab_contents_->profile()->IsOffTheRecord() &&
+      save_file_path.GetValue() != param->dir.ToWStringHack())
     save_file_path.SetValue(param->dir.ToWStringHack());
 
   param->save_type = (index == 1) ? SavePackage::SAVE_AS_ONLY_HTML :
                                     SavePackage::SAVE_AS_COMPLETE_HTML;
 
   if (param->save_type == SavePackage::SAVE_AS_COMPLETE_HTML) {
     // Make new directory for saving complete file.
     param->dir = param->dir.Append(
         param->saved_main_file_path.RemoveExtension().BaseName().value() +
         FILE_PATH_LITERAL("_files"));
@@ skipping 67 matching lines @@
                                int index, void* params) {
   SavePackageParam* save_params = reinterpret_cast<SavePackageParam*>(params);
   ContinueSave(save_params, path, index);
   delete save_params;
 }
 
 void SavePackage::FileSelectionCanceled(void* params) {
   SavePackageParam* save_params = reinterpret_cast<SavePackageParam*>(params);
   delete save_params;
 }