Stop the OverviewButton from appearing on the Add-User screen

ash/wm/overview/window_selector_controller.cc

Index: ash/wm/overview/window_selector_controller.cc
diff --git a/ash/wm/overview/window_selector_controller.cc b/ash/wm/overview/window_selector_controller.cc
index 73b9c148146c1129afb2de9ddd2c4f98de5ff4cc..19e5005877563523d79cb50112c561692922424a 100644
--- a/ash/wm/overview/window_selector_controller.cc
+++ b/ash/wm/overview/window_selector_controller.cc
@@ -30,9 +30,12 @@ WindowSelectorController::~WindowSelectorController() {
 bool WindowSelectorController::CanSelect() {
   // Don't allow a window overview if the screen is locked or a modal dialog is
   // open or running in kiosk app session.
-  return Shell::GetInstance()->session_state_delegate()->
-             IsActiveUserSessionStarted() &&
+  return Shell::GetInstance()
+             ->session_state_delegate()
+             ->IsActiveUserSessionStarted() &&
          !Shell::GetInstance()->session_state_delegate()->IsScreenLocked() &&
+         Shell::GetInstance()->session_state_delegate()->GetSessionState() ==
+             SessionStateDelegate::SESSION_STATE_ACTIVE &&
          !Shell::GetInstance()->IsSystemModalWindowOpen() &&
          Shell::GetInstance()->system_tray_delegate()->GetUserLoginStatus() !=
              user::LOGGED_IN_KIOSK_APP;