Delete Chrome. Now.
Google is using its exceptionally powerful position to make *the browser itself* analyze your browsing behavior and serve that on a plate in the form of "cohorts" to anyone interested.
They are transforming Chrome into a "browsing-history-passport" - right now.
If you care about your intellectual freedom even a little bit, you must put Chrome out of your life as soon as possible. Support others doing the same.
It should not be legal for an online ad company to own the most popular web browser.