LibJS: Convert reference deletion to ThrowCompletionOr

Author: https://github.com/IdanHo
Commit: d73b258874
Pull-request: https://github.com/SerenityOS/serenity/pull/10765
Reviewed-by: https://github.com/linusg ✅

Userland/Libraries/LibJS/Runtime/Reference.h

@@ -131,7 +131,7 @@ public:
 
     void put_value(GlobalObject&, Value);
     Value get_value(GlobalObject&) const;
-    bool delete_(GlobalObject&);
+    ThrowCompletionOr<bool> delete_(GlobalObject&);
 
     String to_string() const;