[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
am: c012ed7db7

Change-Id: I34fa826c334116f6123437530c2d6a1d577e0bb7