Auto merge of #16508 - brainlessdeveloper:fetch-set-origin, r=asajeffrey

Properly set origin of fetch requests

<!-- Please describe your changes on the following line: -->

These changes aim to fix #15247

---
<!-- 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 #15247 (github issue number if applicable).

<!-- Either: -->
- [ ] There are tests for these changes
- [x] These changes do not require tests because cors is already tested with different origins

These changes require changes in tests, but I need help with that (see comments below).

<!-- 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/16508)
<!-- Reviewable:end -->

components/script/dom/worklet.rs

@@ -574,17 +574,14 @@ impl WorkletThread {
         // TODO: Fetch a module graph, not just a single script.
         // TODO: Fetch the script asynchronously?
         // TODO: Caching.
-        // TODO: Avoid re-parsing the origin as a URL.
         let resource_fetcher = self.global_init.resource_threads.sender();
-        let origin_url = ServoUrl::parse(&*origin.unicode_serialization())
-            .unwrap_or_else(|_| ServoUrl::parse("about:blank").unwrap());
         let request = RequestInit {
             url: script_url,
             type_: RequestType::Script,
             destination: Destination::Script,
             mode: RequestMode::CorsMode,
-            origin: origin_url,
             credentials_mode: credentials.into(),
+            origin,
             .. RequestInit::default()
         };
         let script = load_whole_resource(request, &resource_fetcher).ok()