/// <summary>
        /// 全インスタレーション削除(Push送信禁止アプリ)
        /// </summary>
        public static void DeleteInstallationsForPushDisabled()
        {
            ITUtil.UseMasterKeyForPushDisabled();

            try
            {
                DeleteInstallations();
            }
            catch (Exception)
            {
                Assert.Fail("DeleteInstallations() Fail");
            }
            finally
            {
                ITUtil.UseNormalKeyForPushDisabled();
            }
        }