Introduce --cancel-first-run and reduce the strength of --no-first-run.

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 <windows.h>
 #include <msi.h>
 #include <shellapi.h>
 #include <shlobj.h>
 
 #include <string>
@@ skipping 1093 matching lines @@
       system_level_cmd.SetProgram(system_exe_path);
 
       base::FilePath first_run_sentinel;
       InstallUtil::GetSentinelFilePath(
           chrome::kFirstRunSentinel, dist, &first_run_sentinel);
       if (base::PathExists(first_run_sentinel)) {
         // If the Chrome being self-destructed has already undergone First Run,
         // trigger Active Setup and make sure the system-level Chrome doesn't go
         // through first run.
         trigger_active_setup = true;
-        system_level_cmd.AppendSwitch(::switches::kNoFirstRun);
+        system_level_cmd.AppendSwitch(::switches::kCancelFirstRun);
       }
     }
   }
   if (installer_state.FindProduct(BrowserDistribution::CHROME_BINARIES)) {
     // Chrome Binaries should be last; if something else is cancelled, they
     // should stay.
     DCHECK(products[products.size() - 1]->is_chrome_binaries());
   }
 
   installer::InstallStatus install_status = installer::UNINSTALL_SUCCESSFUL;
@@ skipping 722 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;
 }