LibJS: Convert internal_has_property() to ThrowCompletionOr

Author: https://github.com/linusg
Commit: d9895ec12d
Pull-request: https://github.com/SerenityOS/serenity/pull/10266
Reviewed-by: https://github.com/IdanHo ✅

Meta/Lagom/Tools/CodeGenerators/LibWeb/WrapperGenerator.cpp

@@ -1403,7 +1403,7 @@ public:
 
     if (interface.extended_attributes.contains("CustomHasProperty")) {
         generator.append(R"~~~(
-    virtual bool internal_has_property(JS::PropertyName const&) const override;
+    virtual JS::ThrowCompletionOr<bool> internal_has_property(JS::PropertyName const&) const override;
 )~~~");
     }