I think the grandparent is referencing the fact that Referer headers are not propagated from HTTPS sites to HTTP sites. The rationale was that the HTTPS site might have a secret or otherwise sensitive URL.
This is obviously a tremendously stupid and ineffective design, which is why it fits so well with the rest of browser security design :)
You're barking at the wrong tree. Google purposely killed referrers using a intermediate page. If you see this[1] answer on webmasters.SE, they use make the browser pass through a /url redirection page that doesn't have the keywords in the URL. This works in both HTTP and HTTPS.
[1] http://webmasters.stackexchange.com/a/47027