If called several times, registerMDNSNameCallback will crash.
<rdar://problem/41329832>
Created attachment 343831 [details] Patch
Created attachment 343832 [details] Patch
Comment on attachment 343832 [details] Patch Clearing flags on attachment: 343832 Committed r233328: <https://trac.webkit.org/changeset/233328>
All reviewed patches have been landed. Closing bug.