It sounds like they could filter it if they wanted to. There are a couple key points to consider here. I don't know how important any of them are from a legal point of view but I can see how they would apply.
1. They're not responsible if things look different in Chrome than they do in other browsers. Whatever causes it, you agree not to have a cow. (think acid3 test, etc)
2. If you're using their software to do google searches then it's ok if you get a safe search and not an unfiltered one (although you should be able to change this, it's just a cookie based setting).
3. It seems to cover them having parental controls in the browser. People can turn such things on by accident and not know how to disable them (or legally try to claim that the method for disabling them is deliberately obfuscated).
Realistically I doubt they'd do anything stupid like active network filtering. That just isn't what people expect out of their browsers.