Nuke shit I added in 4d7b2ddba9 that shouldn't come until v4

less/forms.less

@@ -137,10 +137,6 @@ output {
   // HTML5 says that controls under a fieldset > legend:first-child won't be
   // disabled if the fieldset is disabled. Due to implementation difficulty, we
   // don't honor that edge case; we style them as disabled anyway.
-  //
-  // Also note that we include `[disabled]` for IE8. All other browsers take the
-  // `:disabled` selector.
-  &:disabled,
   &[disabled],
   &[readonly],
   fieldset[disabled] & {