net/http/cookiejar: treat localhost as secure origin
For development purposes, browsers treat localhost
as a secure origin regardless of protocol.
Fixes #60997
https://developer.mozilla.org/en-US/docs/Web/HTTP/Guides/Cookies#restrict_access_to_cookies
https://bugzilla.mozilla.org/show_bug.cgi?id=
1618113
https://issues.chromium.org/issues/
40120372
Change-Id: I6d31df4e055f2872c4b93571c53ae5160923852b
Reviewed-on: https://go-review.googlesource.com/c/go/+/717860
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Mark Freeman <markfreeman@google.com>
Reviewed-by: Damien Neil <dneil@google.com>