Fixed suggesting adding more users into multi-profile session when we don't have more

chrome/browser/ui/ash/session_state_delegate_chromeos.cc

 // Copyright (c) 2013 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/ui/ash/session_state_delegate_chromeos.h"
 
 #include "ash/multi_profile_uma.h"
 #include "ash/session/session_state_observer.h"
 #include "ash/system/chromeos/multi_user/user_switch_util.h"
 #include "base/bind.h"
@@ skipping 65 matching lines @@
   // actually added to a session.
   // TODO(nkostylev): Adjust this limitation based on device capabilites.
   // http://crbug.com/230865
   return 10;
 }
 
 int SessionStateDelegateChromeos::NumberOfLoggedInUsers() const {
   return user_manager::UserManager::Get()->GetLoggedInUsers().size();
 }
 
+bool SessionStateDelegateChromeos::CanAddUserToMultiProfile(
+    AddUserError* error) const {
+  if (user_manager::UserManager::Get()
+          ->GetUsersAdmittedForMultiProfile()
+          .size() == 0) {
+    if (error)
+      *error = ADD_USER_ERROR_OUT_OF_USERS;
+    return false;
+  }
+  return SessionStateDelegate::CanAddUserToMultiProfile(error);
+}
+
 bool SessionStateDelegateChromeos::IsActiveUserSessionStarted() const {
   return user_manager::UserManager::Get()->IsSessionStarted();
 }
 
 bool SessionStateDelegateChromeos::CanLockScreen() const {
   const user_manager::UserList unlock_users =
       user_manager::UserManager::Get()->GetUnlockUsers();
   return !unlock_users.empty();
 }
 
@@ skipping 176 matching lines @@
 }
 
 void DoSwitchUser(const std::string& user_id) {
   user_manager::UserManager::Get()->SwitchActiveUser(user_id);
 }
 
 void SessionStateDelegateChromeos::TryToSwitchUser(
     const std::string& user_id) {
   ash::TrySwitchingActiveUser(base::Bind(&DoSwitchUser, user_id));
 }