Hi,
Google doesnt allow itself to be displayed in an IFrame , to protect against clickjacking.
Google is sending an "X-Frame-Options: SAMEORIGIN" response header. This option prevents the browser from displaying iFrames that are not hosted on the same domain as the parent page.
See:Mozilla Developer Network - The X-Frame-Options response header
You can open it in a new external window , without an iFrame.
Best Regards,
Tal