mozilla/kitsune — pull request #878 by rlr (2012-10-04 10:36:38+00:00)
Title: [bug 796926] Limit OS selection to those related to the product.

On articles for mobile, only show Android.
On articles for desktop, only show Windows, Linux, Mac.
On articles for both, show all.

To test this out,
* run tests and they should still pass
* go to a mobile only article (/en-US/kb/firefox-android-faq), make sure only Android appears in showfor
* go to a desktop only article (/en-US/kb/flash-113-crashes), make sure only Windows, Linux and Mac appear in showfor
* go to an article for both (/en-US/kb/firefox-sync-take-your-bookmarks-and-tabs-with-you), make sure all OSes appear

r?