LibJS: Convert internal_delete() to ThrowCompletionOr

Author: https://github.com/linusg
Commit: fbfb0bb908
Pull-request: https://github.com/SerenityOS/serenity/pull/10266
Reviewed-by: https://github.com/IdanHo ✅

Userland/Libraries/LibJS/Runtime/Array.cpp

@@ -217,7 +217,7 @@ ThrowCompletionOr<bool> Array::internal_define_own_property(PropertyName const&
 }
 
 // NON-STANDARD: Used to reject deletes to ephemeral (non-configurable) length property
-bool Array::internal_delete(PropertyName const& property_name)
+ThrowCompletionOr<bool> Array::internal_delete(PropertyName const& property_name)
 {
     auto& vm = this->vm();
     if (property_name.is_string() && property_name.as_string() == vm.names.length.as_string())