Add Chromium versions for HTMLContentElement API (#17180)
Add Chromium versions for HTMLContentElement API (#17180)

This PR adds real values for Chromium (Chrome, Opera, Samsung Internet, WebView Android) for the `HTMLContentElement` API.  The collector reports that this is unavailable in Opera Android and Samsung Internet, and the Opera data is just mirrored anyways, so this PR updates them all to `mirror`.
mdn/browser-compat-data,mdn/browser-compat-data,chrisdavidmills/browser-compat-data,chrisdavidmills/browser-compat-data