Store the "browser autorestarted, last session must be restored" information in a preference.

chrome/browser/browser_process_impl.cc

 // Copyright (c) 2011 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/browser/browser_process_impl.h"
 
 #include <map>
 #include <set>
 #include <vector>
 
@@ skipping 965 matching lines @@
       }
   }
 
   // Ensure that our desired switches are set on the new process.
   for (size_t i = 0; i < arraysize(kSwitchesToAddOnAutorestart); ++i) {
     if (!new_cl->HasSwitch(kSwitchesToAddOnAutorestart[i]))
       new_cl->AppendSwitch(kSwitchesToAddOnAutorestart[i]);
   }
 
   DLOG(WARNING) << "Shutting down current instance of the browser.";
-  BrowserList::AttemptExit();
+  BrowserList::AttemptExit(true);
 
   // Transfer ownership to Upgrade.
   upgrade_util::SetNewCommandLine(new_cl.release());
 }
 
 void BrowserProcessImpl::OnAutoupdateTimer() {
   if (CanAutorestartForUpdate()) {
     DLOG(WARNING) << "Detected update.  Restarting browser.";
     RestartBackgroundInstance();
   }
 }
 
 #endif  // (defined(OS_WIN) || defined(OS_LINUX)) && !defined(OS_CHROMEOS)