[Cocoa] Encrypted media playback fails with "ContentKey support for SampleBuffer Renderers" enabled
<rdar://problem/104044401>
Pull request: https://github.com/WebKit/WebKit/pull/8540
Committed 258837@main (01a818734b82): <https://commits.webkit.org/258837@main> Reviewed commits have been landed. Closing PR #8540 and removing active labels.