As part of work toward https://bugs.webkit.org/show_bug.cgi?id=273517, we need to be able to `import LinearMediaKit` from the public SDK.
<rdar://problem/127327242>
Committed 278232@main (b632e2a90f9f): <https://commits.webkit.org/278232@main> Reviewed commits have been landed. Closing PR #27960 and removing active labels.
Committed 278269@main (f33389c2a369): <https://commits.webkit.org/278269@main> Reviewed commits have been landed. Closing PR #28031 and removing active labels.
Reopened Bugzilla. Revert 278269@main causing failures, tracking revert in https://bugs.webkit.org/show_bug.cgi?id=273644.
Committed 278332@main (e4d6c1fe5c1f): <https://commits.webkit.org/278332@main> Reviewed commits have been landed. Closing PR #28108 and removing active labels.