Modern WebKit always enables HDRMediaCapabilitiesEnabled, and we no longer need to toggle this option for A/B testing. We should remove it to reduce the cluttered set of experimental features.
<rdar://problem/102738537>
Pull request: https://github.com/Webkit/WebKit/pull/6900
Committed 257200@main (49dfaedfc2b5): <https://commits.webkit.org/257200@main> Reviewed commits have been landed. Closing PR #6900 and removing active labels.