A browser is troubling but you can opt-out by using a competitor (I think that's a reason why Google still supports Firefox). It's when they start buying ISPs that you should treat it seriously because that's an attempt to control the platform from the street to the servers.
They're replacing the current android browser with one which is based on the (desktop) Chrome browser. It still uses webkit as the rendering engine though. It the everything-but-the-rendering-engine that they're changing.
