We added the GetOriginsWithPushSubscriptions IPC in 243347 but never ended up using it since we ended up going with another approach to handling the interaction between ITP and Web Push (see 246468). We should remove it now.
<rdar://problem/102832536>
Pull request: https://github.com/WebKit/WebKit/pull/6996
Committed 257265@main (ce6da4432f86): <https://commits.webkit.org/257265@main> Reviewed commits have been landed. Closing PR #6996 and removing active labels.