[whatwg/fetch] Specify the default age value used when Access-Control-Max-Age isn't present (#990)

Chromium uses 5 seconds as a default.  I'm modifying Gecko accordingly in https://bugzilla.mozilla.org/show_bug.cgi?id=1607615.  There is a WPT test which fails only in Firefox because we currently don't consider a default for when this header is missing.

-- 
You are receiving this because you are subscribed to this thread.
Reply to this email directly or view it on GitHub:
https://github.com/whatwg/fetch/issues/990