Magnifier#mDestroyLock was introduced by below change: Idf0373ab0d5033d56da0f6f45d7d953f7e796813 Then related code was removed by below change: Ia4c75b5b997e0ed94d5a3814dd4507a8fffa124d With this change, Magnifier#mDestroyLock becomes redundant, useless lock. This change intends to remove this redundant lock. Change-Id: Ifa3f83f8953a3d992e26a952d9ac2f3343b0dc9e Signed-off-by: jiajia tang <tangjiajia@xiaomi.com>