Auto merge of #28546 - yvt:feat-cow-infra, r=jdm

Implement `Location`'s custom internal methods

This PR partly resurrects #16501 and introduces the use of principals object to associate objects and Realms with origins. Using this infrastructure, this PR implements [the custom internal methods][1] of the `Location` interface, which is "maybe-cross-origin".

Unimplemented/incomplete things:

 - Other maybe-cross-origin interfaces, namely `WindowProxy` and `DissimilarWindowLocation`, aren't implemented correctly yet (causing most test cases of `tests/wpt/web-platform-tests/html/browsers/origin/cross-origin-objects/cross-origin-objects.html` to fail).
     - `WindowProxy`: #28556
 - [The "perform a security check" operation][2] and `Location`'s non-cross-origin properties' relevant `Document` origin checks aren't implemented either (not sure if they are covered by the existing tests).
 - There are a slight deviation from the standard and inefficiency in `CrossOriginGetOwnPropertyHelper`'s current implementation.
     - #28557

[1]: https://html.spec.whatwg.org/multipage/#the-location-interface
[2]: https://html.spec.whatwg.org/multipage/browsers.html#integration-with-idl

---
- [x] `./mach build -d` does not report any errors
- [x] `./mach test-tidy` does not report any errors
- [x] These changes fix #16243 and make some progress in #2382

---
- [x] There are tests for these changes OR
- [ ] These changes do not require tests because ___

components/script/script_thread.rs

@@ -35,7 +35,6 @@ use crate::dom::bindings::root::ThreadLocalStackRoots;
 use crate::dom::bindings::root::{Dom, DomRoot, MutNullableDom, RootCollection};
 use crate::dom::bindings::str::DOMString;
 use crate::dom::bindings::trace::JSTraceable;
-use crate::dom::bindings::utils::WRAP_CALLBACKS;
 use crate::dom::customelementregistry::{
     CallbackReaction, CustomElementDefinition, CustomElementReactionStack,
 };
@@ -99,7 +98,6 @@ use hyper_serde::Serde;
 use ipc_channel::ipc::{self, IpcSender};
 use ipc_channel::router::ROUTER;
 use js::glue::GetWindowProxyClass;
-use js::jsapi::JS_SetWrapObjectCallbacks;
 use js::jsapi::{
     JSContext as UnsafeJSContext, JSTracer, JS_AddInterruptCallback, SetWindowProxyClass,
 };
@@ -1295,7 +1293,6 @@ impl ScriptThread {
         let cx = runtime.cx();
 
         unsafe {
-            JS_SetWrapObjectCallbacks(cx, &WRAP_CALLBACKS);
             SetWindowProxyClass(cx, GetWindowProxyClass());
             JS_AddInterruptCallback(cx, Some(interrupt_callback));
         }