It's close enough to being a legal problem that an internal lawyer immediately responded, specifically with the issue of 'why did you put Chrome first'?
That there were options, doesn't absolve them of possible anti-competitive acts.
For example, imagine that they did this to a browser made by a small company? Or another search engine?
Google has enough power that it doesn't need to form an overt strategy in many of these areas. Just by having assertive employees, loose rules, and Engineers not considering implications beyond their noses ... they can make all sorts of little 'wins' like this.
Today, the Chrome/Mozilla market share issue is fundamentally about power, not about 'the better product' and has Google has an infinite amount of money to subsidize that layer of the market, they will dominate, much as they do with Android. If the iPhone weren't one of the greatest products of a generation, and it were just some other thingy ... then Android would be fully dominant as well. Arguably the only reason that Mozilla exists is to allay concerns of competition.
Google has an incredible amount of power, I'm actually thankfully it's not aggressively abused, but soon as the founders leave, culture erodes, other priorities sink in, I believe there's little doubt that bias will creep into search engine results, for example.
