When you delete your Google account you won't have access anymore to the following functions:
- Services which need a login like Gmail, Google Drive or Google Calendar
- Data linked to you Google account like emails, pictures or transactions
- Subscriptions or content you have bought on YouTube (e.g. movies or music)
- Content you've bought in Google Play (e.g. apps like NAVIGON, movies, games, etc.)
- Saved information in Google Chrome
- Your Gmail username
Further information can be found here.