Mac detected tapsnake infection

When I visit a website using google chrome in my MacBook Pro, it prompt the message from a place, "www.securedominonline.com" saying as follows.

****Dont Restart Your Computer ****

Mac Detected TAPSNAKE infection, The Infections detected, indicate some recent downloads on the computer which in turn has created problems on the computer.Call Mac professionals at 800-130-1949 and share this code B2957E to the Technician to Fix This.

PLEASE DO NOT SHUT DOWN OR RESTART THE COMPUTER, DOING THAT MAY LEAD TO DATA LOSS AND POSSIBLE FAILURE OF THE OPERATING SYSTEM, AND POTENTIAL NON BOOTABLE SITUATION RESULTING IN COMPLETE DATA LOSS. CONTACT LIVE CERTIFIED TECHNICIANS TO RESOLVE THE ISSUE CALLING TOLL FREE: 800-130-1949

I suspect it as a scam. But I cannot quit Chrome. Can any friend her provide a help? Thank you!