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

Change-Id: Ic1fbb847f80f8a4abb7cf08c3aa112fc4eadb16e