Maybe you'd think that the above comment is in contradiction with a previous comment I made:

> Just very very briefly went over this PR. Do we need a gaMobile service? Can't we just add isMobile to the gaBrowserSniffer service?

I'm not sure the previous gaMobile service took the "mobile" permalink param when I initially reviewed this PR.

Anyway, we can leave the "browser sniffer" part in gaBrowserSniffer and re-add a gaMobile service that would look like this:

```
module.factory('gaMobile', ['gaBrowserSniffer', 'gaPermalink', function(gaBrowserSniffer, gaPermalink) {
  var mobileParam = gaPermalink.getParams().mobile;
  return (gaBrowserSniffer.mobile && mobileParam != 'false') || mobileParam == 'true';
}]);
```