Given that it's open-source and anyone can roll and distribute a tweaked version of Chromium (and many have, notably Microsoft), it's really hard to see an argument here that Google is acting anti-competitively. If anything it's very pro-competitive to give away your secret sauce to your competitors.
Just because their browser is more popular than you would like, and you don't like a feature they're adding, doesn't mean a judge is going to stop them from adding it.