script: Support creating a DOMStringList for any global. (#37567)

There were a lot of crashing IndexedDB tests caused by code in
DOMStringList that required a Window object despite being exposed to
non-Window globals.

Testing: Lots of existing tests no longer crash.
Fixes: part of #6963

Signed-off-by: Josh Matthews <josh@joshmatthews.net>

components/script/dom/idbobjectstore.rs

@@ -79,7 +79,7 @@ impl IDBObjectStore {
             name: DomRefCell::new(name),
             key_path,
 
-            index_names: DOMStringList::new(global.as_window(), Vec::new(), can_gc),
+            index_names: DOMStringList::new(global, Vec::new(), can_gc),
             transaction: Default::default(),
             // FIXME:(arihant2math)
             auto_increment: false,