Google analytics fix for IE8 SSL warning

Undoes #2977 which while cleaner in principle breaks IE8 SSL support.  I have verified this in my production app with a local override of `_google_analytics.html.erb`.

I will completely understand if no one wants this patch.

Thanks!

Edit:  By 'breaks IE8 SSL support' I meant "introduces a mixed content page is insecure" sort of warning on all storefront page loads from IE8 that will scare away customers.