Backed out changeset fb2c0eb9ad70 (bug 1485867) for having the wrong bug number in the commit message

toolkit/themes/linux/global/menu.css

@@ -80,7 +80,7 @@ menucaption {
 /* ::::: menu/menuitems in menulist popups ::::: */
 
 menulist > menupopup {
-  font: inherit;
+  font: message-box;
 }
 
 menulist > menupopup > menuitem,

toolkit/themes/windows/global/menu.css

@@ -170,7 +170,7 @@ menuitem[_moz-menuactive="true"] {
 /* ::::: menu/menuitems in menulist popups ::::: */
 
 menulist > menupopup {
-  font: inherit;
+  font: message-box;
 }
 
 menulist > menupopup > menuitem,