Posted by Andrew.
Regarding to Google, "Google Chrome is a browser that combines a minimal design with sophisticated technology to make the web faster, safer, and easier". Unfortunately, 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. More information about Chrome unique ID, there is an article from Google official document: General privacy: Privacy, unique IDs, and RLZ.
To protect your privacy and remove the unique ID of Google Chrome from your computer, there is a FREE tool that developed by AQLSoft.com - Chrome Privacy Protector, it automatically deletes the unique Client ID before each run of Google Chrome.
Screenshot: before deleting Google Chrome unique ID
Screenshot: after deleting Google Chrome unique ID