Add public accounts to UserManager

chrome/browser/chromeos/chrome_browser_main_chromeos.cc

Index: chrome/browser/chromeos/chrome_browser_main_chromeos.cc
diff --git a/chrome/browser/chromeos/chrome_browser_main_chromeos.cc b/chrome/browser/chromeos/chrome_browser_main_chromeos.cc
index db458ad15aa1a1196c926ef02a24d5f77aa74361..30d0662403cc5b43ece4187d819997e7450e7591 100644
--- a/chrome/browser/chromeos/chrome_browser_main_chromeos.cc
+++ b/chrome/browser/chromeos/chrome_browser_main_chromeos.cc
@@ -653,6 +653,10 @@ void ChromeBrowserMainPartsChromeos::PostMainMessageLoopRun() {
   // Delete ContactManager while |g_browser_process| is still alive.
   contact_manager_.reset();
 
+  // Let the UserManager unregister itself as an observer of the CrosSettings
+  // singleton before it is destroyed.
+  UserManager::Get()->Shutdown();
+
   ChromeBrowserMainPartsLinux::PostMainMessageLoopRun();
 }