Connection::Identifier should be a struct for all ports Makes it easier to make Identifier movable
<rdar://problem/99376431>
Pull request: https://github.com/WebKit/WebKit/pull/3847
Committed 254157@main (769a9e574726): <https://commits.webkit.org/254157@main> Reviewed commits have been landed. Closing PR #3847 and removing active labels.