Here’s a link to a .reg file to create the value.
Usual disclaimer: Use at your own risk. Backup your registry before making any changes.
You can disable this under Settings > Notifications & actions in the windows settings app or the registry key below.
This key/path may not exist.
Create Enabled (DWORD) at HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Notifications\Settings\Chrome
Change value to 0
Computer\HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Notifications\Settings\Chrome
Enabled
Tip: You can copy and paste into the address bar in registry editor.