Disable registering, unregistering, and setting default browser...

chrome/installer/setup/setup_main.cc

 // Copyright (c) 2009 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 <string>
 #include <windows.h>
 #include <msi.h>
 #include <shellapi.h>
 #include <shlobj.h>
 
@@ skipping 581 matching lines @@
                                       IDS_INSTALL_OS_NOT_SUPPORTED_BASE, NULL);
     return installer_util::OS_NOT_SUPPORTED;
   }
 
   // Initialize COM for use later.
   AutoCom auto_com;
   if (!auto_com.Init(system_install)) {
     return installer_util::OS_ERROR;
   }
 
-  int exit_code = 0;
-  if (HandleNonInstallCmdLineOptions(parsed_command_line, system_install,
-                                     exit_code))
-    return exit_code;
-
   // Some command line options don't work with SxS install/uninstall
   if (InstallUtil::IsChromeSxSProcess()) {
     if (system_install ||
         parsed_command_line.HasSwitch(
             installer_util::switches::kForceUninstall) ||
         parsed_command_line.HasSwitch(
             installer_util::switches::kMakeChromeDefault) ||
         parsed_command_line.HasSwitch(
             installer_util::switches::kRegisterChromeBrowser) ||
         parsed_command_line.HasSwitch(
             installer_util::switches::kRemoveChromeRegistration) ||
         parsed_command_line.HasSwitch(
             installer_util::switches::kInactiveUserToast) ||
         parsed_command_line.HasSwitch(
             installer_util::switches::kSystemLevelToast)) {
       return installer_util::SXS_OPTION_NOT_SUPPORTED;
     }
   }
 
+  int exit_code = 0;
+  if (HandleNonInstallCmdLineOptions(parsed_command_line, system_install,
+                                     exit_code))
+    return exit_code;
+
   if (system_install && !IsUserAnAdmin()) {
     if (win_util::GetWinVersion() >= win_util::WINVERSION_VISTA &&
         !parsed_command_line.HasSwitch(installer_util::switches::kRunAsAdmin)) {
       std::wstring exe = parsed_command_line.program();
       std::wstring params(command_line);
       // Append --run-as-admin flag to let the new instance of setup.exe know
       // that we already tried to launch ourselves as admin.
       params.append(L" --");
       params.append(installer_util::switches::kRunAsAdmin);
       DWORD exit_code = installer_util::UNKNOWN_STATUS;
@@ skipping 45 matching lines @@
                     dist->GetApplicationName().c_str(),
                     MB_OK);
     }
   }
 
   // Note that we allow the status installer_util::UNINSTALL_REQUIRES_REBOOT
   // to pass through, since this is only returned on uninstall which is never
   // invoked directly by Google Update.
   return dist->GetInstallReturnCode(install_status);
 }