From left: Expedia Group chairman Barry Diller, CEO Ariane Gorin, former CEO and current Uber CEO Dara Khosrowshahi, and founder Rich Barton at Expedia’s Explore partner conference in Las Vegas this week. (Expedia Group Photo) From her office overlooking the atrium at Expedia Group’s sunlit headquarters campus on the Seattle waterfront, CEO Ariane Gorin puts the online travel giant’s 30-year history into three chapters, each tied to a major infl…