LibWeb: Make factory method of DOM::AccessibilityTreeNode fallible

Author: https://github.com/kennethmyhra
Commit: 1e03aa0ece
Pull-request: https://github.com/SerenityOS/serenity/pull/17491
Reviewed-by: https://github.com/linusg ✅

Userland/Libraries/LibWeb/DOM/AccessibilityTreeNode.h

@@ -17,7 +17,7 @@ namespace Web::DOM {
 class AccessibilityTreeNode final : public JS::Cell {
     JS_CELL(AccessibilityTreeNode, JS::Cell)
 public:
-    static JS::NonnullGCPtr<AccessibilityTreeNode> create(Document*, DOM::Node const*);
+    static WebIDL::ExceptionOr<JS::NonnullGCPtr<AccessibilityTreeNode>> create(Document*, DOM::Node const*);
     virtual ~AccessibilityTreeNode() override = default;
 
     JS::GCPtr<DOM::Node> value() const { return m_value; }