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

Properly set origin of fetch requests

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These changes aim to fix #15247

---
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- [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).

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- [ ] 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).

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components/gfx/font_cache_thread.rs

@@ -216,7 +216,8 @@ impl FontCache {
                     url: url.clone(),
                     type_: RequestType::Font,
                     destination: Destination::Font,
-                    origin: url.clone(),
+                    // TODO: Add a proper origin - Can't import GlobalScope from gfx
+                    // We can leave origin to be set by default
                     .. RequestInit::default()
                 };