Screen Sharing has been added to my MacBook Air remotely

I was working on my MacBook Air. Yesterday I did download google chrome. When i opened my google I was just sitting and then I see this message pop up and said, screen sharing has been added to my pc remotely. Asked what I wanted to do with it…..there was a box that said to remove it and to report it…..

can someone tell me about this….

Please if anyone could assist me in any way, please please please help me….or tell me what to do.

[Edited by Moderator]