How to remove plusone.js script

im trying to get rid of this. Ive removed the plugin but still getting this error…

A script with an insecure url of “http://apis.google.com/js/plusone.js” was loaded on line: 104 of https://www.mydomain.com.au/articles/.

I cant see where to locate the page called articles from within dreamweaver or under appearance, header.php, footer.php, function.php and so on.

its not under index.php.

where is it? How do I access it to remove this script tag??

thanks