[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 am: a66e843ded  -s ours am: e2f98a3f49
am: f62f9bc10f

Change-Id: I18b963b1fe6a58735efa8c4d4540b28dc875b6a3