Add missing 'onClose' extern for mdSideNav.
Reference: https://material.angularjs.org/latest/api/service/$mdSidenav
@@ -548,7 +548,8 @@ md.$toast.prototype.simple = function() {};
* isOpen: function():boolean,
* toggle: function(),
* open: function(),
- * close: function()
+ * close: function(),
+ * onClose: function(function()),
* }}
*/
md._sidenavService;
