Show invisible user on login screen if there is space after other user removal

chrome/browser/chromeos/login/existing_user_controller.h

Index: chrome/browser/chromeos/login/existing_user_controller.h
diff --git a/chrome/browser/chromeos/login/existing_user_controller.h b/chrome/browser/chromeos/login/existing_user_controller.h
index 61e941a26acaec2ec3cb4abeec2a8181fb55d804..f648b225bf57ce2b5f8172a56395b7881480d445 100644
--- a/chrome/browser/chromeos/login/existing_user_controller.h
+++ b/chrome/browser/chromeos/login/existing_user_controller.h
@@ -136,9 +136,12 @@ class ExistingUserController : public WmMessageListener::Observer,
   views::Widget* background_window_;
   BackgroundView* background_view_;
 
-  // The set of UserControllers.
+  // The set of visible UserControllers.
   std::vector<UserController*> controllers_;
 
+  // The set of invisible UserControllers.
+  std::vector<UserController*> invisible_controllers_;
+
   // Used to execute login operations.
   scoped_ptr<LoginPerformer> login_performer_;