cros: Refactor oobe LoadUsers to include non-serialized user list.

chrome/browser/chromeos/login/screens/user_selection_screen.h

Index: chrome/browser/chromeos/login/screens/user_selection_screen.h
diff --git a/chrome/browser/chromeos/login/screens/user_selection_screen.h b/chrome/browser/chromeos/login/screens/user_selection_screen.h
index 6ca995808b250c85f8d8cbe8b120be06f25672a6..2ec76b28aff005429dc17488bb44d3ad762925e7 100644
--- a/chrome/browser/chromeos/login/screens/user_selection_screen.h
+++ b/chrome/browser/chromeos/login/screens/user_selection_screen.h
@@ -47,7 +47,7 @@ class UserSelectionScreen
       const AccountId& owner,
       bool is_signin_to_add);
 
-  virtual void Init(const user_manager::UserList& users, bool show_guest);
+  virtual void Init(const user_manager::UserList& users);
   void OnUserImageChanged(const user_manager::User& user);
   void OnBeforeUserRemoved(const AccountId& account_id);
   void OnUserRemoved(const AccountId& account_id);
@@ -134,9 +134,6 @@ class UserSelectionScreen
   LoginDisplayWebUIHandler* handler_ = nullptr;
   LoginDisplay::Delegate* login_display_delegate_ = nullptr;
 
-  // Whether to show guest login.
-  bool show_guest_ = false;
-
   // Purpose of the screen (see constants in OobeUI).
   const std::string display_type_;