There are a few places where AtomString is expected, but String is being used. The AtomString constructor is explicit after bug #239950. There are a few other failures in the code under the USE(GSTREAMER_MPEGTS) guard.
Pull request: https://github.com/WebKit/WebKit/pull/3103
Committed 253212@main (8871637ce2ee): <https://commits.webkit.org/253212@main> Reviewed commits have been landed. Closing PR #3103 and removing active labels.
<rdar://problem/98321922>