It seems Chrome actually implements the old proxy API, not the new direct proxy API. It has the old Proxy.create() instead of Proxy.for(), which is the way to

It seems Chrome actually implements the old proxy API, not the new direct proxy API. It has the old Proxy.create() instead of Proxy.for(), which is the way to define a proxy as per direct proxy API. So if anyone wants to implement proxies in current Chrome, they have to refer to the old proxy API (which is why they have linked to it).