Do not create login items if the user deleted a previous one.

chrome/common/pref_names.h

 // Copyright (c) 2012 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 <stddef.h>
@@ skipping 692 matching lines @@
 extern const char kAuthServerWhitelist[];
 extern const char kAuthNegotiateDelegateWhitelist[];
 extern const char kGSSAPILibraryName[];
 extern const char kAllowCrossOriginAuthPrompt[];
 
 extern const char kRegisteredProtocolHandlers[];
 extern const char kIgnoredProtocolHandlers[];
 extern const char kCustomHandlersEnabled[];
 
 extern const char kUserCreatedLoginItem[];
+extern const char kUserRemovedLoginItem[];
 extern const char kBackgroundModeEnabled[];
 
 extern const char kDevicePolicyRefreshRate[];
 extern const char kUserPolicyRefreshRate[];
 
 extern const char kRecoveryComponentVersion[];
 extern const char kComponentUpdaterState[];
 
 extern const char kWebIntentsEnabled[];
 
@@ skipping 31 matching lines @@
 extern const char kNetworkProfileWarningsLeft[];
 extern const char kNetworkProfileLastWarningTime[];
 
 #if defined(OS_MACOSX)
 extern const char kMacLeopardObsoleteInfobarLastShown[];
 #endif  // defined(OS_MACOSX)
 
 }  // namespace prefs
 
 #endif  // CHROME_COMMON_PREF_NAMES_H_