Bug 172152 introduced a check of the NEFilterSource selector setSourceAppPid in order to support OS's that didn't support it. All supported Cocoa platforms now support it, so the check can be removed.
<rdar://problem/55505761>
Created attachment 379192 [details] Patch
Comment on attachment 379192 [details] Patch Clearing flags on attachment: 379192 Committed r250161: <https://trac.webkit.org/changeset/250161>
All reviewed patches have been landed. Closing bug.