fixed bug on sites with iframe

when using site with cross domain iframe, browser generates lot of exception, and that exceptions are unhandled.
This is causing other js on site to malfunction (as unhandled exception breaks JS vent loop)

sites with error:
http://www.aliexpress.com/
https://vk.com

exception:
Uncaught SecurityError: Failed to read the 'contentDocument' property from 'HTMLIFrameElement':
Blocked a frame with origin "http://www.aliexpress.com" from accessing a frame with origin "http://static.ak.facebook.com".
The frame being accessed set "document.domain" to "facebook.com", but the frame requesting access did not.
Both must set "document.domain" to the same value to allow access. jquery.atd.iframe.js:11

![SecurityError](https://raw.githubusercontent.com/wiki/Mart-Bogdan/atd-chrome/iframe_sec_error.png)