[automerger] Fix security hole in GateKeeperResponse. am: e74cae8f7c am: b1141b6ff0 am: 1cd9e8096f am: 6dfc8d8d4d am: a3c1de7e49 am: 4acf4fabf4 am: 40317127f4 am: 159cd14334 am: 24587d57cf

Change-Id: If5cad5c0f361acda25df4d90de06821d16e689c0