In your Google Trusted Store set-up, there is a process where you need to use a special link to validate your GTS badge.
You find this special link in the popup after the blue “Test” button where you see your store listed. Here, you see a panel called “Browsers to test” and an instruction to “Copy and paste this URL into your browser window”
Once you do this, you’ll see a beige bar like so:
This lets you preview your GTS integration so they can certify your website in their program. Annoyingly, this bar appears not to go away by itself, nor can I find a way to disable it in GTS.
To remove it, you must remove the cookies in your browser associated with googlecommerce.com
In Chrome, go to Advanced > Content Settings > All Cookies and Data and search for the specific domains above.
Then delete those cookies completely from your browser.