Google Chrome's core business is data mining and while a majority of users came to "google" Google sits on an enormous data-mountain and is selling this information to the highest bidder.
All others do likewise and they interlink and they sell user profiles and earn on clicks. This is all going on in a stealthy way through obfuscated javascripts with multi-user hacks to get a better performance, sneaky web beacons, hidden iFrames and a lot of other techniques helped by technologies like browser and other fingerprinting and geo-location so "every" user on the interwebs is utterly and completely transparent nowadays.
So, yes, Google is a big player there, but your hoster may be doing it, a website you are visiting, your ISP, etc. etc.
I for instance work Google Chrome via Privacy Guard and a couple of extensions to diminish tracking. I tweaked the browser quite to my liking.
Cache cleaning via Click and Clean is quite effective. A pity is that there is no access to deeper layers of the browser build like as with firefox, and api's are Google's and a lot there has not been made available. It is also shown that Google Chrome is not very fond of ad-blockers (it will cost a lot of effort to let an adblocker function on a Google driven smartphone, because ad blocking is hampering Google's core business).
We can point the finger at Google but all are into it, a question of the pot calling the kettle black (see image).
Google also made the Internet a safer place with Google Safebrowing and Unmasked parasites and their active browser security technology,
polonus