The new head of China’s banking regulator pledged to crack down on shadow lending by working more closely with other authorities and drafting rules to rein in risks stemming from the expansion of wealth-management products. “Banks, trusts, fund-management firms, brokerages and insurers all have asset-management operations, but because they have different regulators and are subject to different rules, there’s been some chaos,” Guo Shuqing said in Beijing at his first news briefing after being named chairman of the China Banking Regulatory Commission.