GUAC-958: Work around iOS 7 visibility issue (again) by using object instead of iframe. The resize sensor needs to be where it used to be in the DOM for proper operation.

guacamole/src/main/webapp/app/osk/directives/guacOsk.js

@@ -106,7 +106,7 @@ angular.module('osk').directive('guacOsk', [function guacOsk() {
                     };
 
                     // Resize keyboard whenever element changes size
-                    resizeSensor.contentWindow.addEventListener('resize', resizeListener);
+                    resizeSensor.contentDocument.defaultView.addEventListener('resize', resizeListener);
 
                 }