But anti-trust stalled Microsoft's efforts at a critical time and allowed Firefox and Safari (like Gecko) to restore a standards-based web from an IE-based web. It's not a cure all but it worked. IE had 95% marketshare in 2002 and Firefox took a third of that from them in a few years thanks to anti-trust and the consent decree it forced on MS.

Chrome has nowhere near 95% market share so it would be hard to make the same case against them.

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.