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

chrome/common/pref_names.h

 // 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.
 
 // Constants for the names of various preferences, for easier changing.
 
 #ifndef CHROME_COMMON_PREF_NAMES_H_
 #define CHROME_COMMON_PREF_NAMES_H_
 
 #include "build/build_config.h"
@@ skipping 217 matching lines @@
 extern const wchar_t kPageInfoWindowPlacement[];
 extern const wchar_t kKeywordEditorWindowPlacement[];
 extern const wchar_t kMemoryCacheSize[];
 
 extern const wchar_t kDownloadDefaultDirectory[];
 extern const wchar_t kDownloadExtensionsToOpen[];
 extern const wchar_t kDownloadDirUpgraded[];
 
 extern const wchar_t kSaveFileDefaultDirectory[];
 
+extern const wchar_t kSelectFileLastDirectory[];
+
 extern const wchar_t kHungPluginDetectFrequency[];
 extern const wchar_t kPluginMessageResponseTimeout[];
 
 extern const wchar_t kSpellCheckDictionary[];
 
 extern const wchar_t kExcludedSchemes[];
 
 extern const wchar_t kSafeBrowsingClientKey[];
 extern const wchar_t kSafeBrowsingWrappedKey[];
 
@@ skipping 65 matching lines @@
 
 extern const wchar_t kCloudPrintServiceURL[];
 extern const wchar_t kCloudPrintProxyId[];
 extern const wchar_t kCloudPrintAuthToken[];
 extern const wchar_t kCloudPrintXMPPAuthToken[];
 extern const wchar_t kCloudPrintEmail[];
 
 }  // namespace prefs
 
 #endif  // CHROME_COMMON_PREF_NAMES_H_