We need to give users of the _setIgnoresAppBoundDomains SPI time to convert uses to iOS only, so in the meantime we should still compile the SPI for macOS so we don't break anything.
rdar://problem/69025655
Created attachment 408970 [details] Patch
Committed r267176: <https://trac.webkit.org/changeset/267176> All reviewed patches have been landed. Closing bug and clearing flags on attachment 408970 [details].