CompaniesBEIJING, Dec 15 (Reuters) - China's industry regulator on Monday approved two Chinese cars with level-3 autonomous driving capabilities, marking the first time such vehicles have been cleared by the national regulator as legitimate products ready for mass adoption.The Ministry of Industry and Information Technology approved the two electric sedans from state-owned automakers Changan Auto (000625.SZ), opens new tab and BAIC Motor (600733.SS), opens new tab in its latest automobile produc...