The websockets speck is still in draft. Nothing is impossible and there is no reason a browser could not implement their own extension of websockets to enable p2p. Have some imagination.
I thought you were talking about websockets as it exists today, not some hypothetical future extension. See my reply in the other thread about why that might not be a good idea.
Of course I'm talking hypothetical. The original article is about an experimental p2p feature in an open source browser that is several months at a minimum from even being in a beta release of Chrome.