[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: 30496345f4

Change-Id: I4cdb29b998a029886aa8af6040e49b96a0a935fe