It says google set it. So unless you are employee of Google, you can’t change the htaccess rules for support.google.com. (Plus, you would need approval).
If you open your site in Iframe, it’ll refuse to display, It’s normal because of security system.
Even if you enable same origin that won’t work again.
In this case the X-Frame-Origin header is generated by Google’s support page. So you can’t change that. Although, if you wanted to, you could just create a file with the name .htaccess and add the line for it. A .htaccess file is not a special file which request a system tool to generate.
The interesting case is the URL you’re referring to, which is the Google Cookies URL. You are redirected to this page if you fail this security system:
Specifically, this means your browser did not accept the cookies generated by the security challenge. So please make sure your browser accepts cookies, and there isn’t some plugin, network block or virus scanner preventing that from working correctly.