chat: Picking up breaking JS API changes from http://v.io/c/15404
chat: Picking up breaking JS API changes from http://v.io/c/15404

MultiPart: 5/10
Change-Id: Ia7e30e1b38760c9733444cc345a25023ed931a4e

vanadium/chat,vanadium/chat,vanadium/chat,vanadium/chat,vanadium/chat