Bug 1274410 - clean up some css in toolkit/themes/osx now when we've dropped support for 10.6-10.8. r=gijs.

toolkit/themes/osx/global/menu.css

@@ -86,15 +86,6 @@ menuitem[src] > .menu-iconic-left > .menu-iconic-icon {
   -moz-box-pack: end;
 }
 
-/* The native menuarrow we use is 9px wide on 10.7+ and 8px wide on 10.6,
- * so it needs to be 'pulled in' one pixel more by the negative margin in
- * order to align properly: */
-@media not all and (-moz-mac-lion-theme) {
-  .menu-right {
-    margin-inline-end: -10px;
-  }
-}
-
 .menu-right {
   list-style-image: none;
   -moz-appearance: menuarrow;

toolkit/themes/osx/global/tabbox.css

@@ -50,11 +50,9 @@ tab:last-of-type {
   padding-inline-end: 2px;
 }
 
-@media (-moz-mac-lion-theme) {
-  tab[visuallyselected="true"] {
-    color: #FFF;
-    text-shadow: rgba(0, 0, 0, 0.4) 0 1px;
-  }
+tab[visuallyselected="true"] {
+  color: #FFF;
+  text-shadow: rgba(0, 0, 0, 0.4) 0 1px;
 }
 
 .tab-middle {