That only works for the current Chrome session.
Save this code to a .reg file, then double click the file and ‘Merge’ it when asked:
Windows Registry Editor Version 5.00
[HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Google]
[HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Google\Chrome]
"DefaultPluginsSetting"=dword:00000001
[HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Google\Chrome\PluginsAllowedForUrls]
"1"="http://*"
"2"="https://*"