if your using windows 7 then go to start menu >>control panel>> programs(uninstall a program) then select delta search and remove it. After that refresh your browser and hopefully you will not see that again.
You can remove delta search from Google Chrome- first you should go Google chrome setting then click on (set page) option and remove delta search and set www.google.com. and also remove from (Set which search engine is used when searching from the omnibox.) and set Google.