Add SessionStateObserver with ActiveUserChanged()

chrome/browser/ui/ash/chrome_shell_delegate_views.cc

Index: chrome/browser/ui/ash/chrome_shell_delegate_views.cc
diff --git a/chrome/browser/ui/ash/chrome_shell_delegate_views.cc b/chrome/browser/ui/ash/chrome_shell_delegate_views.cc
index bdc86fff44b95673ac302af5dd8329be4724f8b6..2e072066d7d3e3495840baf9eea68109421caed6 100644
--- a/chrome/browser/ui/ash/chrome_shell_delegate_views.cc
+++ b/chrome/browser/ui/ash/chrome_shell_delegate_views.cc
@@ -9,6 +9,7 @@
 #include "chrome/browser/prefs/session_startup_pref.h"
 #include "chrome/browser/profiles/profile_manager.h"
 #include "chrome/browser/ui/ash/caps_lock_delegate_views.h"
+#include "chrome/browser/ui/ash/session_state_delegate_views.h"
 #include "chrome/browser/ui/ash/window_positioner.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/browser_list.h"
@@ -75,6 +76,10 @@ ash::CapsLockDelegate* ChromeShellDelegate::CreateCapsLockDelegate() {
   return new CapsLockDelegate();
 }
 
+ash::SessionStateDelegate* ChromeShellDelegate::CreateSessionStateDelegate() {
+  return new SessionStateDelegate;
+}
+
 void ChromeShellDelegate::SaveScreenMagnifierScale(double scale) {
 }