mash: Move //ash/session to //ash/common/session

ash/session/session_state_delegate.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 "ash/session/session_state_delegate.h"
-
-namespace ash {
-
-bool SessionStateDelegate::IsInSecondaryLoginScreen() const {
-  return GetSessionState() ==
-      ash::SessionStateDelegate::SESSION_STATE_LOGIN_SECONDARY;
-}
-
-bool SessionStateDelegate::CanAddUserToMultiProfile(
-    SessionStateDelegate::AddUserError* error) const {
-  if (!IsMultiProfileAllowedByPrimaryUserPolicy()) {
-    if (error)
-      *error = ADD_USER_ERROR_NOT_ALLOWED_PRIMARY_USER;
-    return false;
-  }
-  if (NumberOfLoggedInUsers() >= GetMaximumNumberOfLoggedInUsers()) {
-    if (error)
-      *error = ADD_USER_ERROR_MAXIMUM_USERS_REACHED;
-    return false;
-  }
-  return true;
-}
-
-} // namespace ash