[DO NOT MERGE] Updating Security String to 2017-08-05 on nyc-dev bug:62388772 am: 2b93753bc4 am: 8828ffc63e am: edda32c5e3  -s ours am: af114e0286  -s ours am: 332ef64b0e  -s ours
am: c56a72d5fc  -s ours

Change-Id: I94cd4cfcded3eadbde4b0ca4e18c8dd907174c2f