If Google started ranking sites that use AdSense higher than other sites, you could probably prove that in court fairly easily — your lawyers would make them hand over their ranking code during discovery, and it would say `if (usesAdSense) score++`, and you'd win.
But if they made (are making) subtle web platform changes via their control of the browsing platform that hurt competitors and help Google, that's extremely difficult to prove. Look at third-party cookies, for example.
This first one is about dominant market position by paying for placement on all surfaces (iPhone, Firefox, etc.) plus chrome. So splitting off chrome and android make sense in the context of the suit.
On the other hand, Google would argue that Doubleclick is Google, and everything else Google does is just to create channels for ads, and acquire data for ad targeting and pricing.
I believe that this will happen though, at some point in the next few years.