Auto merge of #23090 - miller-time:nav-fetch-referrer, r=gterzian

Add referrer to navigation fetch request

<!-- Please describe your changes on the following line: -->
Implement step 13 of [following hyperlinks](https://html.spec.whatwg.org/#following-hyperlinks-2) and step 14.3 of [window open](https://html.spec.whatwg.org/#window-open-steps), as well as other referrer- and fetch-related updates.

---
<!-- Thank you for contributing to Servo! Please replace each `[ ]` by `[X]` when the step is complete, and replace `___` with appropriate data: -->
- [x] `./mach build -d` does not report any errors
- [x] `./mach test-tidy` does not report any errors
- [x] These changes fix #22890 (GitHub issue number if applicable)

<!-- Either: -->
- [ ] There are tests for these changes OR
- [ ] These changes do not require tests because ___

<!-- Also, please make sure that "Allow edits from maintainers" checkbox is checked, so that we can help you if you get stuck somewhere along the way.-->

<!-- Pull requests that do not address these steps are welcome, but they will require additional verification as part of the review process. -->

<!-- Reviewable:start -->
---
This change is [<img src="https://reviewable.io/review_button.svg" height="34" align="absmiddle" alt="Reviewable"/>](https://reviewable.io/reviews/servo/servo/23090)
<!-- Reviewable:end -->

components/constellation/network_listener.rs

@@ -12,7 +12,7 @@ use ipc_channel::ipc;
 use ipc_channel::router::ROUTER;
 use msg::constellation_msg::PipelineId;
 use net::http_loader::{set_default_accept, set_default_accept_language};
-use net_traits::request::{Destination, RequestBuilder};
+use net_traits::request::{Destination, Referrer, RequestBuilder};
 use net_traits::response::ResponseInit;
 use net_traits::{CoreResourceMsg, FetchChannels, FetchMetadata, FetchResponseMsg};
 use net_traits::{IpcSend, NetworkError, ResourceThreads};
@@ -109,7 +109,10 @@ impl NetworkListener {
                             .url_list
                             .push(metadata.final_url.clone());
 
-                        self.request_builder.referrer_url = metadata.referrer.clone();
+                        self.request_builder.referrer = metadata
+                            .referrer
+                            .clone()
+                            .map(|referrer_url| Referrer::ReferrerUrl(referrer_url));
                         self.request_builder.referrer_policy = metadata.referrer_policy;
 
                         self.res_init = Some(ResponseInit {