Merge "[DO NOT MERGE] Updating Platform Security String to 2017-12-01 on nyc-dev. Bug: 67774760" into nyc-dev am: deca8f381d am: e38beb27b7 am: a028a4205d am: 97a05c4593 am: ec5d8daaa2  -s ours am: 869e4a5300
am: b51b52411a

Change-Id: I8154312980a03f4ecea0876a1d6585917ff1785a