Remove WebPageProxy::machSendRightCallback as it is dead code.
<rdar://problem/59658805>
Created attachment 391399 [details] Patch
Comment on attachment 391399 [details] Patch r=me
Comment on attachment 391399 [details] Patch Clearing flags on attachment: 391399 Committed r257148: <https://trac.webkit.org/changeset/257148>
All reviewed patches have been landed. Closing bug.
<rdar://problem/59658878>