Have you checked for Windows updates?

I seem to recall having very similar to this problem about 8 weeks ago on Windows 7. As well as ccleaner and malwarebytes (which found nothing) I think it finally cleared after 2 de-installs and re-installs of Chrome, losing all my extensions and having to re-download them and finally fixed after a second Windows 7 update from Microsoft was notified and this being downloaded and installed.

As antivirus failed to find anything I suspect an earlier Windows update that was somehow incompatible with Chrome was the cause.

Until it was solved I got so fed up that I switched to Mozilla for a while.