De-indexed in search is a bit different from effectively blocked in the browser. If Chrome says your site is dangerous and actually your site is harmless, are they defaming your website? If Google choose not to include you in their search engine, that could still be an issue, but it's probably a lot more nuanced.
Probably not, but Google EU is in Ireland and their libel laws are likely to be a lot like those of England, which is to say super pro the person who feels wronged.
