LibWeb: Make factory method of DOM::LiveNodeList fallible

Author: https://github.com/kennethmyhra
Commit: 24d7e688fc
Pull-request: https://github.com/SerenityOS/serenity/pull/17491
Reviewed-by: https://github.com/linusg ✅

Userland/Libraries/LibWeb/DOM/LiveNodeList.h

@@ -18,7 +18,7 @@ class LiveNodeList final : public NodeList {
     WEB_PLATFORM_OBJECT(LiveNodeList, NodeList);
 
 public:
-    static JS::NonnullGCPtr<NodeList> create(JS::Realm&, Node& root, Function<bool(Node const&)> filter);
+    static WebIDL::ExceptionOr<JS::NonnullGCPtr<NodeList>> create(JS::Realm&, Node& root, Function<bool(Node const&)> filter);
     virtual ~LiveNodeList() override;
 
     virtual u32 length() const override;