[DO NOT MERGE] Updating Security String to 2017-08-01 on nyc-dev bug:62388772 am: a847c0b23c am: c486b5d047 am: 92c1ca1f5c am: 93b5d26067 am: dbaa8cfaee  -s ours
am: bdc526e833

Change-Id: Ice2f49dd3f7cd434c3591a72dc33addc45c4062b