[DO NOT MERGE] Update Security String to 2019-06-01 Bug:129374896 Merged-In:1f8f84de6133f82df8210fa9214475d7c5aaa2f0
am: 3e8a1393a7

Change-Id: I2a8ce7b192ccb2bbf23c342c88da45d9c3b3f070