Fixes#8640.
This commit adds a neterror page that displays really really basic
information about what went wrong with your request, which is an
improvement over the current state of blank page.
It also fixes the problem of certificate validation errors not
triggering the cert error page, since for some reason the function
string seems to have turned lowercase.
---
- [x] `./mach build -d` does not report any errors
- [x] `./mach test-tidy` does not report any errors
- [x] These changes fix#8640.
- [x] These changes do not require tests because I'm not sure how to test this, suggestions welcome!
r?@jdm
Source-Repo: https://github.com/servo/servo
Source-Revision: 1e835e330df49da068928231a5b55b165c360a42
Johann Hofmann