Duplicate setup.exe into an identical executable and point Active Setup to that executable instead.

chrome/installer/util/installer_state.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/util/installer_state.h"
 
 #include <algorithm>
 #include <functional>
 #include <utility>
 
@@ skipping 772 matching lines @@
   // And for the binaries if this is a multi-install.
   if (is_multi_install()) {
     InstallUtil::AddInstallerResultItems(
         system_install, multi_package_binaries_distribution()->GetStateKey(),
         status, string_resource_id, launch_cmd, install_list.get());
   }
   if (!install_list->Do())
     LOG(ERROR) << "Failed to record installer error information in registry.";
 }
 
+bool InstallerState::RequiresActiveSetup() const {
+  return system_install() && FindProduct(BrowserDistribution::CHROME_BROWSER);
+}
+
 }  // namespace installer