Clear the installer stage info after patching setup.exe. We're seeing update checks for installs...

chrome/installer/setup/setup_main.cc

 // Copyright (c) 2011 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 <windows.h>
 #include <msi.h>
 #include <shellapi.h>
 #include <shlobj.h>
 
 #include <string>
@@ skipping 791 matching lines @@
         ScheduleDirectoryForDeletion(temp_path.path().value().c_str());
       }
     }
 
     *exit_code = InstallUtil::GetInstallReturnCode(status);
     if (*exit_code) {
       LOG(WARNING) << "setup.exe patching failed.";
       installer_state->WriteInstallerResult(status, IDS_SETUP_PATCH_FAILED_BASE,
           NULL);
     }
+    // We will be exiting normally, so clear the stage indicator.
+    installer_state->UpdateStage(installer::NO_STAGE);
   } else if (cmd_line.HasSwitch(installer::switches::kShowEula)) {
     // Check if we need to show the EULA. If it is passed as a command line
     // then the dialog is shown and regardless of the outcome setup exits here.
     std::wstring inner_frame =
         cmd_line.GetSwitchValueNative(installer::switches::kShowEula);
     *exit_code = ShowEULADialog(inner_frame);
     if (installer::EULA_REJECTED != *exit_code)
       GoogleUpdateSettings::SetEULAConsent(*installer_state, true);
   } else if (cmd_line.HasSwitch(
       installer::switches::kRegisterChromeBrowser)) {
@@ skipping 396 matching lines @@
   if (!(installer_state.is_msi() && is_uninstall))
     // Note that we allow the status installer::UNINSTALL_REQUIRES_REBOOT
     // to pass through, since this is only returned on uninstall which is
     // never invoked directly by Google Update.
     return_code = InstallUtil::GetInstallReturnCode(install_status);
 
   VLOG(1) << "Installation complete, returning: " << return_code;
 
   return return_code;
 }