Fix remaining hardcoded ampproject.net URLs in build #7323
Description
related to #4293
@erwinmombay Can we change this to variable also?
https://github.com/ampproject/amphtml/blob/master/gulpfile.js#L569
{{ message }}
related to #4293
@erwinmombay Can we change this to variable also?
https://github.com/ampproject/amphtml/blob/master/gulpfile.js#L569