Additionally, if this flag ever goes away, the "kFormatUrlOmitTrivialSubdomains" is the internal flag for this, it seems[1], though its description says it's "Not in kFormatUrlOmitDefaults"[2].

Back when they removed the "http:" off of URLs, I used to use a hex editor to turn the kFormatUrlOmitHTTP bit flag off every time I got a new build, so I'd get the URL formatting I wanted, but eventually lost the mental wherewithal to continue the hack every week.

[1] https://github.com/chromium/chromium/blob/3d41e77125f3de8d72...

[2] https://github.com/chromium/chromium/blob/78aae16be65e409075...