[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: 9f58c6ab5c
am: d7e4ff45dd

Change-Id: Icf0898f07e226c901c852efbcefaf1b4a55ce47e