Great! It works, thanks for the quick fix!
Wow you are correct, I was not aware that this old piece of javascript was still in my header.php template file!
Thanks, I deleted it and purged the cache.
I also did a grep on ‘googlesyndication’ in my WordPress folder, just one hit now:
wp-content/plugins/jetpack/modules/wordads/class-wordads.php: $hints[] = '//tpc.googlesyndication.com';