It's very unlikely that any damage has been made to your system, especially if none of those 3 antimalware programs reported anything strange. Also, keep in mind that Chrome's tabs are sandboxed so it's hard (though not impossible) to alter a PC from the browser, if you haven't downloaded anything strange.
However, I was curious on how could a web freeze a browser, and found the Fun Fun Loop, a ridiculously short JavaScript snippet that does exactly that, by just making the browser run out of memory. As stated by the author, its effects go from freezing the browser to even crashing the whole operative system.
At first I wondered what's the point (from a scammer POV) in making someone else's browser/computer stop working, but after reading the messages in your screenshot, I realized it's a very smart move: an unexperienced user could really think that his computer has been blocked by their ISP, Microsoft, the CIA or whoever else.
They call to get their computer unblocked, and I think we all know how this ends...