SourceBufferParserAVFObjC only checks that AVStreamDataParser class exists, but on iPhone device the class is available, it just returns nil when being initialised.
<rdar://problem/104065947>
Pull request: https://github.com/WebKit/WebKit/pull/8439
Committed 258716@main (1f860580a5b3): <https://commits.webkit.org/258716@main> Reviewed commits have been landed. Closing PR #8439 and removing active labels.