Mac: Chrome's been using its own notification system for a while, but having two sets of notifications, Chrome's and the built-in OS X ones, is a tad annoying. Thankfully, you can now enable native notifications.
You'll need to enable a flag to do this. Enter this into your URL bar
chrome://flags/#enable-native-notifications and enable the the feature. After you restart Chrome, your notifications should all run through OS X's Notification Center. It's still a little early in development, so you might notice some problems and you won't get any more rich notifications, but at least all your notifications will be in one place.
Chrome is finally getting native push notifications on Mac [The Next Web]