Cocoa SharedMemory::Handle should use MachSendRight - The Handle should be movable - The code should not duplicate the implementation in MachSendRight
<rdar://problem/99379026>
Pull request: https://github.com/WebKit/WebKit/pull/3849
Committed 254037@main (a5a7844e79bd): <https://commits.webkit.org/254037@main> Reviewed commits have been landed. Closing PR #3849 and removing active labels.