Baidu Inc.’s revenue grew at the slowest pace in more than a year, as China’s flagging economy put pressure on its core advertising business.Revenue for the three months ended March edged up 1% to 31.5 billion yuan ($4.4 billion), compared with the 31.4 billion yuan average estimate. Net income for the same period came to 5.4 billion yuan, versus a projection of 4 billion yuan....