Google Chrome is using a client_id variable which is unique for every Chrome user, and which can be used to create exact user profiles of a user's actions while using Google Chrome. Chrome Privacy Protector is a FREE tool that developted by http://www.aqlsoft.com, it automatically deletes the unique Client ID before each run of Google Chrome. To protect your privacy and remove the unique ID, just click the "Remove unique ID now" button.

Chrome Privacy Protector software screenshot