[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
am: d7e2b3bd06

Change-Id: Ibe5ab867d51eb8163993be3d5e48a928a6759e5e