There was no warning and the plugins are not in the Tools list.
The cure is to enter
chrome://plugins/
as a URI in the address bar and then set the Curl Surge RTE plugins to Always allowed.
There was no warning as with either Java or Adobe Flash.
NOTE: on that plugins page, the Curl plugins were NOT listed as DISABLED !
Google has decided that they know what is best for what they view as "little used plugins" - something decidely anti-competitive.