Allow --force-uninstall for SxS Chrome and disallow --self-destruct.

chrome/installer/setup/setup_main.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/setup_main.h"
 
 #include <windows.h>
 #include <msi.h>
 #include <shellapi.h>
 #include <shlobj.h>
@@ skipping 1699 matching lines @@
   if (!com_initializer.succeeded()) {
     installer_state.WriteInstallerResult(
         installer::OS_ERROR, IDS_INSTALL_OS_ERROR_BASE, NULL);
     return installer::OS_ERROR;
   }
 
   // Some command line options don't work with SxS install/uninstall
   if (InstallUtil::IsChromeSxSProcess()) {
     if (system_install ||
         prefs.is_multi_install() ||
-        cmd_line.HasSwitch(installer::switches::kForceUninstall) ||
+        cmd_line.HasSwitch(installer::switches::kSelfDestruct) ||
         cmd_line.HasSwitch(installer::switches::kMakeChromeDefault) ||
         cmd_line.HasSwitch(installer::switches::kRegisterChromeBrowser) ||
         cmd_line.HasSwitch(installer::switches::kRemoveChromeRegistration) ||
         cmd_line.HasSwitch(installer::switches::kInactiveUserToast) ||
         cmd_line.HasSwitch(installer::switches::kSystemLevelToast)) {
       return installer::SXS_OPTION_NOT_SUPPORTED;
     }
   }
 
   // Some command line options are no longer supported and must error out.
@@ skipping 75 matching lines @@
     // 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;
 }