[multi-profiles] Allow bringing up sign in UI even if all users are restricted per their policies

chrome/browser/chromeos/login/users/user_manager_impl.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/chromeos/login/users/user_manager_impl.h"
 
 #include <cstddef>
 #include <set>
 
 #include "ash/multi_profile_uma.h"
@@ skipping 306 matching lines @@
 }
 
 UserList UserManagerImpl::GetUsersAdmittedForMultiProfile() const {
   // Supervised users are not allowed to use multi-profiles.
   if (logged_in_users_.size() == 1 &&
       GetPrimaryUser()->GetType() != User::USER_TYPE_REGULAR) {
     return UserList();
   }
 
   UserList result;
-  int num_users_allowed = 0;
   const UserList& users = GetUsers();
   for (UserList::const_iterator it = users.begin(); it != users.end(); ++it) {
     if ((*it)->GetType() == User::USER_TYPE_REGULAR && !(*it)->is_logged_in()) {
       MultiProfileUserController::UserAllowedInSessionResult check =
           multi_profile_user_controller_->
               IsUserAllowedInSession((*it)->email());
       if (check == MultiProfileUserController::
               NOT_ALLOWED_PRIMARY_USER_POLICY_FORBIDS) {
         return UserList();
       }
 
       // Users with a policy that prevents them being added to a session will be
       // shown in login UI but will be grayed out.
       // Same applies to owner account (see http://crbug.com/385034).
       if (check == MultiProfileUserController::ALLOWED ||
           check == MultiProfileUserController::NOT_ALLOWED_POLICY_FORBIDS ||
           check == MultiProfileUserController::NOT_ALLOWED_OWNER_AS_SECONDARY) {
         result.push_back(*it);
-        if (check == MultiProfileUserController::ALLOWED)
-          num_users_allowed++;
       }
     }
   }
 
-  // We only show multi-profiles sign in UI if there's at least one user that
-  // is allowed to be added to the session.
-  if (!num_users_allowed)
-    result.clear();
-
   return result;
 }
 
 const UserList& UserManagerImpl::GetLoggedInUsers() const {
   return logged_in_users_;
 }
 
 const UserList& UserManagerImpl::GetLRULoggedInUsers() {
   // If there is no user logged in, we return the active user as the only one.
   if (lru_logged_in_users_.empty() && active_user_) {
@@ skipping 1741 matching lines @@
 }
 
 void UserManagerImpl::DeleteUser(User* user) {
   const bool is_active_user = (user == active_user_);
   delete user;
   if (is_active_user)
     active_user_ = NULL;
 }
 
 }  // namespace chromeos