LibWeb: Make Storage GC-allocated

Author: https://github.com/awesomekling
Commit: 2ac8e3db3a
Pull-request: https://github.com/SerenityOS/serenity/pull/14816
Reviewed-by: https://github.com/ADKaster
Reviewed-by: https://github.com/linusg ✅

Userland/Libraries/LibWeb/HTML/Window.h

@@ -100,8 +100,8 @@ public:
 
     Selection::Selection* get_selection_impl();
 
-    RefPtr<HTML::Storage> local_storage();
-    RefPtr<HTML::Storage> session_storage();
+    JS::NonnullGCPtr<HTML::Storage> local_storage();
+    JS::NonnullGCPtr<HTML::Storage> session_storage();
 
     Window* parent();