Exiting Chrome from the wrench menu should close the User Manager.

chrome/browser/lifetime/application_lifetime.cc

Index: chrome/browser/lifetime/application_lifetime.cc
diff --git a/chrome/browser/lifetime/application_lifetime.cc b/chrome/browser/lifetime/application_lifetime.cc
index f02bd0666b44a9dae9dc768918ca69803795aecd..b186a8d7687fc9c41e7f36d2b146130f0edc2d8e 100644
--- a/chrome/browser/lifetime/application_lifetime.cc
+++ b/chrome/browser/lifetime/application_lifetime.cc
@@ -31,6 +31,7 @@
 #include "chrome/browser/ui/browser_tabstrip.h"
 #include "chrome/browser/ui/browser_window.h"
 #include "chrome/browser/ui/tabs/tab_strip_model.h"
+#include "chrome/browser/ui/user_manager.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/common/pref_names.h"
 #include "content/public/browser/browser_shutdown.h"
@@ -167,6 +168,7 @@ void AttemptUserExit() {
 #else
   // Reset the restart bit that might have been set in cancelled restart
   // request.
+  UserManager::Hide();
   PrefService* pref_service = g_browser_process->local_state();
   pref_service->SetBoolean(prefs::kRestartLastSessionOnShutdown, false);
   AttemptExitInternal(false);