property should not be defined in $.mobile.

js/jquery.mobile.core.js

@@ -51,8 +51,6 @@
 		//configure meta viewport tag's content attr:
 		metaViewportContent: "width=device-width, minimum-scale=1, maximum-scale=1",
 
-		nativeSelectMenus: false,
-
 		//support conditions that must be met in order to proceed
 		gradeA: function(){
 			return $.support.mediaquery;