prefetchDNS() in DNSCFNet.cpp is not implemented.
Created attachment 34981 [details] proposed patch
Comment on attachment 34981 [details] proposed patch r=me > 54 host.releaseRef(); // The host will be released from callback. I'd change this to "The host will be released in clientCallback".
Committed revision 47391. Made one post-review change: with a null callback info, CFHostStartInfoResolution() works synchronously, even if the client has been set.