Chrome hijacked by Yahoo

Some sort of malware has attached itself to my browser and now redirects any and all searches to Yahoo.

I see others have had this issue and I've followed a few different tutorials to try and remove it with no luck. I've tried Spybot, AdwCleaner, MalwareBytes, HitmanPro, and Zoek - they found and removed a few things, but whatever this thing is it's tenacious.

Any help would be appreciated!