When MEDIA_STREAM is disabled, the preferences MediaStreamEnabled and MockCaptureDevicesEnabled are not defined, which triggers a build error when calling the FEATURE_DEFAULT macro.
280080@main was reverted by https://commits.webkit.org/280276@main, so this is not happening anymore. Closing.
A variant of the initial PR was merged as 280453@main that has the same problem, so reopening this and setting the new regression revision.
Pull request: https://github.com/WebKit/WebKit/pull/30268
Committed 280454@main (22714bafb93d): <https://commits.webkit.org/280454@main> Reviewed commits have been landed. Closing PR #30268 and removing active labels.