nsISocketProvider::NewSocket API change

[Darin Fisher]

I am trying to make Mozilla support IPv6 under WinXP. This is really
just a matter of calling getaddrinfo. However, I also need to take care
to always create a socket of the right family (i.e., that matching the
results of getaddrinfo). This is no problem for sockets created by
necko; however, since necko can alternatively use
nsISocketProvider::NewSocket to create sockets, there is a problem.
That method unfortunately does not allow me to pass information about
the socket family down to the socket provider. This impacts SSL, SOCKS,
and other nsISocketProvider implementations. Indeed, there's no reason
why nsISocketProvider must even create a socket (on some platforms, in
some cases). Fortunately, nsISocketProvider is not a frozen interface,
so most likely I will just rev it to add the address family as a new
parameter. I'm a little bit concerned about breaking compatibility with
existing apps (though I don't know of any that actually use this
interface), so I'm just sending this email out more or less as a
warning... if you happen to know of any apps that might break, please
let me know.

Darin