BufferedChangeEvent spec proposal was modified to no longer have optional TimeRanges.
<rdar://problem/117272337>
Pull request: https://github.com/WebKit/WebKit/pull/19355
Committed 269831@main (d9d71c746a46): <https://commits.webkit.org/269831@main> Reviewed commits have been landed. Closing PR #19355 and removing active labels.