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

chrome/installer/util/installer_state.cc

Index: chrome/installer/util/installer_state.cc
diff --git a/chrome/installer/util/installer_state.cc b/chrome/installer/util/installer_state.cc
index c30a602ee6ce196f39617ed562433cb2d803fac6..a720137cdead92f64a3153fd0751ba544cc0ae74 100644
--- a/chrome/installer/util/installer_state.cc
+++ b/chrome/installer/util/installer_state.cc
@@ -790,4 +790,8 @@ void InstallerState::WriteInstallerResult(
     LOG(ERROR) << "Failed to record installer error information in registry.";
 }
 
+bool InstallerState::RequiresActiveSetup() const {
+  return system_install() && FindProduct(BrowserDistribution::CHROME_BROWSER);
+}
+
 }  // namespace installer