removed window._gaq closure

When Google's `ga.js` file loads it overwrites the global variable; depending on the timing of `ga.js`'s load (async script)  you might be pushing to an effective noop array ref. Tried to maintain the local var ref pattern in case a third party lib (ghostery, etc...) messed with the global.

(Duplicate/reopen of #2169 per a fat fingers misclick/close)