[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

Change-Id: Ia6d0e906b99f7e014428685e3acc7d2cb93c9c31