[DO NOT MERGE] Updating Security String to 2017-08-05 on nyc-dev bug:62388772 am: 2b93753bc4 am: 8828ffc63e am: edda32c5e3 am: 4f43543b11
am: 7801b3d4b6  -s ours

Change-Id: I66f1d69ea99409328136b4d9b77f284382ed1535