Bug 1695162 - Migrate from custom hashtable iteration to range-based for in accessible, dom/animation, dom/base, dom/localstorage, gfx/thebes. r=nika

Differential Revision: https://phabricator.services.mozilla.com/D106895

dom/base/FragmentOrElement.cpp

@@ -1721,8 +1721,8 @@ NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INTERNAL(FragmentOrElement)
           static_cast<IntersectionObserverList*>(
               elem->GetProperty(nsGkAtoms::intersectionobserverlist));
       if (observers) {
-        for (auto iter = observers->Iter(); !iter.Done(); iter.Next()) {
-          DOMIntersectionObserver* observer = iter.Key();
+        for (const auto& entry : *observers) {
+          DOMIntersectionObserver* observer = entry.GetKey();
           cb.NoteXPCOMChild(observer);
         }
       }