function innerCallback(error, errorCode, backendEntries)
        {
            if (error) {
                callback(FileError.SECURITY_ERR);
                return;
            }

            if (errorCode !== 0) {
                callback(errorCode);
                return;
            }

            callback(errorCode, backendEntries);
        }
@param {?Protocol.Error} error
@param {number} errorCode
@param {!Array.<!FileSystemAgent.Entry>=} backendEntries