Tencent Holdings Ltd., China’s biggest Internet company, bought a $84.4 million stake in ELong Inc. (LONG) to expand in online travel, following Google Inc.’s purchase of ITA Software Inc. Tencent acquired a 16 percent stake in ELong to become the online-travel company’s second-biggest shareholder behind Expedia Inc., the companies said in a joint statement yesterday. Expedia paid $41.2 million to increase its stake in Elong to 56 percent, according to the statement.