bindings: Fixes layouttests when moving attributes to prototype chains.

LayoutTests/fast/dom/Geolocation/script-tests/enabled.js

 description("Tests that the navigator.geolocation object is present.");
 
 function hasGeolocationProperty()
 {
     for (var property in navigator) {
         if (property == "geolocation")
             return true;
     }
     return false;
 }
 
 shouldBeTrue("typeof navigator.geolocation == 'object'");
 shouldBeTrue("hasGeolocationProperty()");
 shouldBeTrue("'geolocation' in navigator");
-shouldBeTrue("navigator.hasOwnProperty('geolocation')");
 
 window.jsTestIsAsync = false;