Removing .background-size() LESS mixin, deprecated in MW 1.27 as part of T121473: background-size mixin should not generate vendor prefixes
Android 2 is pretty much dead, 0.1% as of 2019-03-24.
Firefox 3.6 is also affected, is also at 0.1% as of 2019-03-24.
Moreover the mixin is
- not used consistently at all, putting the support at esoteric treatment levels
- not necessary to show basic content or even interact with the site
- Remove all instances of .background-size()
- Remove mixin and add note to release notes, target MW 1.33