Giant U.S. retailer Wal-Mart Stores Inc (WMT.N) plans to expand its footprint in China by nearly a third by opening 115 new stores by 2017, the firm’s chief executive said, in a renewed push to lure China’s grocery shoppers despite slowing growth. “Our aim is to become an integral part of China’s economy,” Chief Executive Doug McMillon said at a news conference in Beijing on Wednesday. The development plans come as the U.S.