Google Calendar Sync did die and nothing official replaced it for 2013, but two workable routes remain depending on whether you need to see or to edit across the divide.

Seeing only, the built in route: subscribe each side to the other. In Google Calendar's settings copy the Secret address in iCal format, then in Outlook use Calendar, Open Calendar, From Internet and paste it. For the reverse, publish the Outlook calendar or simply live with one direction, since the double booking problem usually only needs your work calendar aware of family commitments. Internet subscriptions are read only by nature and refresh on a delay measured in hours, both worth knowing before trusting them for same day changes.

Editing both ways, the add-in route: Outlook CalDav Synchronizer, free and open source, connects Outlook 2013 to Google's CalDAV interface for genuine two way sync of events including edits and deletions. Setup is pointing it at the Google account through its profile wizard, granting access on Google's consent screen and choosing the sync interval. It carries the usual add-in caveats, it loads with Outlook and occasionally needs updating after Google adjusts their API, but it has been the standard answer for this exact pairing for years.

Choose by need: one way visibility costs nothing and breaks never, two way sync costs an add-in and delivers the full merge. Plenty of people run the subscription for a month and only then decide whether editing across is worth the extra moving part.