Resolve the conflict that auto-launch has with the background mode feature (part 1).

chrome/installer/setup/install.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 "chrome/installer/setup/install.h"
 
 #include <shlobj.h>
 #include <time.h>
 #include <vector>
 
@@ skipping 433 matching lines @@
       if (result == FIRST_INSTALL_SUCCESS) {
         installer_state.UpdateStage(installer::CONFIGURE_AUTO_LAUNCH);
 
         // Add auto-launch key if specified in master preferences.
         bool auto_launch_chrome = false;
         prefs.GetBool(
             installer::master_preferences::kAutoLaunchChrome,
             &auto_launch_chrome);
         if (auto_launch_chrome) {
           auto_launch_util::SetWillLaunchAtLogin(
-              true,
               installer_state.target_path(),
-              ASCIIToUTF16(chrome::kInitialProfile));
+              ASCIIToUTF16(chrome::kInitialProfile),
+              auto_launch_util::FLAG_ENABLE,     // Auto start.
+              auto_launch_util::FLAG_PRESERVE);  // Background mode.
         }
       }
     }
 
     installer_state.UpdateStage(installer::REMOVING_OLD_VERSIONS);
 
     installer_state.RemoveOldVersionDirectories(
         new_version,
         existing_version.get(),
         install_temp_path);
   }
 
   return result;
 }
 
 }  // namespace installer