[DO NOT MERGE] Updating Security String to 2017-08-01 on nyc-dev bug:62388772 am: a847c0b23c am: c486b5d047 am: 92c1ca1f5c  -s ours am: 5cada70115  -s ours am: 525c88d2c8  -s ours
am: d9109cc1c6  -s ours

Change-Id: Ifccd5223842b85ba689e9cf7d86e8c3f782d471a