I doubt that it has actually been deleted but that your Icon has somehow got a corrupted link.
Google Chrome should be still be found by clicking Start - All Programs - Google Chrome. It is probably also on the task bar (bottom left).
A further check is to see if iti is still listed under programs that can be unistalled through the control panel.
If you can start Chrome through the above then how did the icon get corrupted?
In all events a system restore may be the answer but a simple re-boot may solve the problem.
It may be wise to scan with Malwarebytes.