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

chrome/browser/background/background_mode_manager.cc

 // 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.
 
 #include <algorithm>
 #include <string>
 #include <vector>
 
 #include "base/base_paths.h"
 #include "base/bind.h"
@@ skipping 198 matching lines @@
   // We're going away, so exit background mode (does nothing if we aren't in
   // background mode currently). This is primarily needed for unit tests,
   // because in an actual running system we'd get an APP_TERMINATING
   // notification before being destroyed.
   EndBackgroundMode();
 }
 
 // static
 void BackgroundModeManager::RegisterPrefs(PrefService* prefs) {
   prefs->RegisterBooleanPref(prefs::kUserCreatedLoginItem, false);
+  prefs->RegisterBooleanPref(prefs::kUserRemovedLoginItem, false);
   prefs->RegisterBooleanPref(prefs::kBackgroundModeEnabled, true);
 }
 
 
 void BackgroundModeManager::RegisterProfile(Profile* profile) {
   // We don't want to register multiple times for one profile.
   DCHECK(background_mode_data_.find(profile) == background_mode_data_.end());
   BackgroundModeInfo bmd(new BackgroundModeData(current_command_id_++,
                                                 profile));
   background_mode_data_[profile] = bmd;
@@ skipping 538 matching lines @@
     }
   }
   return profile_it;
 }
 
 bool BackgroundModeManager::IsBackgroundModePrefEnabled() const {
   PrefService* service = g_browser_process->local_state();
   DCHECK(service);
   return service->GetBoolean(prefs::kBackgroundModeEnabled);
 }