IANAL but would not that be grounds for abuse of dominant position? Using their dominance in web search to undercut competing browser vendors?
For reference, IE accounted for ~96% of browser use when that whole antitrust case was happening.
In this case, ~90% of web searches go through Google[0]. So they are using the fact that they are the number one web search engine to convince users to switch to Google Chrome.
[0]: https://www.statista.com/statistics/216573/worldwide-market-...
That would be Microsoft Chrome :]