Add ARC++ kiosk menu items and ability to start kiosk session.

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 8b9664c96a5188133531c695dc3ff250be5dc25f..8cd1f92445850ac608989704132ece5830566ceb 100644
--- a/chrome/browser/chromeos/chrome_browser_main_chromeos.cc
+++ b/chrome/browser/chromeos/chrome_browser_main_chromeos.cc
@@ -783,7 +783,6 @@ void ChromeBrowserMainPartsChromeos::PostMainMessageLoopRun() {
   BootTimesRecorder::Get()->AddLogoutTimeMarker("UIMessageLoopEnded", true);
 
   arc_service_launcher_->Shutdown();
-  arc_kiosk_app_manager_.reset();
 
   // Unregister CrosSettings observers before CrosSettings is destroyed.
   shutdown_policy_forwarder_.reset();
@@ -879,6 +878,10 @@ void ChromeBrowserMainPartsChromeos::PostMainMessageLoopRun() {
   // Ash needs to be closed before UserManager is destroyed.
   ChromeBrowserMainPartsLinux::PostMainMessageLoopRun();
 
+  // Destroy ArcKioskAppManager after its observers are removed when Ash is
+  // closed above.
+  arc_kiosk_app_manager_.reset();
+
   if (!chrome::IsRunningInMash())
     AccessibilityManager::Shutdown();