There are two ways to unsubscribe from Google Chrome Push Notifications:

Option 1:

1. Access the website in the browser from whose push service you want to unsubscribe.
2. Click on the lock icon on the left side of the address field.
3. In the selection list, choose Block next to Notifications.
4. To apply the updated settings, reload the website.

Option 2:

1. Open the Settings in the menu at the top right.
2. Scroll to the bottom end and fold out the extended menu.
3. In the Privacy and Security menu item, click on Site Settings and then on Notifications.
4. The push services can be removed via the displayed 3 points to the right of the respective website.