Based on feedback from Sam Weinig in Bug 215201:
> > It seems unfortunate to have Cocoa specific types referenced in a platform
> > agnostic file. I think this likely needs more thought on how this should
> > abstracted to support all loader backends, if and when they want to support
> > exposing the cname chain and support mutation of cookies.
The result of the discussion was a suggestion that more of this functionality should live in WebCore::Cookies.
1. Figure out why this doesn't work today.
2. Fix WebCore::Cookies as necessary.
3. Move NetworkSession ITP feature code to WebCore::Cookies.