function processChatGroupSummary(groupSummary, preProcessed) {
	if (groupSummary === null) {
		return groupSummary;
	}

	if (!preProcessed) {
		groupSummary = preProcessObject(groupSummary);
	}

	if (groupSummary.top_members) {
		groupSummary.top_members = groupSummary.top_members.map(accountid => SteamID.fromIndividualAccountID(accountid));
	}

	return groupSummary;
}
Process a chat group summary.
@param {object} groupSummary
@param {boolean} [preProcessed=false]
@returns {ChatRoomGroupSummary}