Fix V8 bindings for named constructors to set prototype object correctly

third_party/WebKit/Source/bindings/templates/attributes.cpp.tmpl

 {% from 'utilities.cpp.tmpl' import declare_enum_validation_variable, v8_value_to_local_cpp_value %}
 
 {##############################################################################}
 {% macro attribute_getter(attribute, world_suffix) %}
 static void {{attribute.name}}AttributeGetter{{world_suffix}}(
 {%- if attribute.is_data_type_property %}
 const v8::PropertyCallbackInfo<v8::Value>& info
 {%- else %}
 const v8::FunctionCallbackInfo<v8::Value>& info
 {%- endif %}) {
@@ skipping 443 matching lines @@
   {{cpp_class_or_partial}}V8Internal::{{attribute.name}}AttributeSetter{{world_suffix}}(v8Value, info);
   {% endif %}
 }
 {% endmacro %}
 
 
 {##############################################################################}
 {% macro attribute_configuration(attribute) %}
 {% from 'utilities.cpp.tmpl' import property_location %}
 {% if attribute.constructor_type %}
-{% set getter_callback =
-       '%s::%sConstructorGetterCallback' % (v8_class_or_partial, attribute.name)
-       if attribute.needs_constructor_getter_callback else
-       'v8ConstructorAttributeGetter' %}
+  {% if attribute.needs_constructor_getter_callback %}
+    {% set getter_callback = '%s::%sConstructorGetterCallback' % (v8_class_or_partial, attribute.name) %}
+  {% else %}
+    {% set getter_callback = 'V8%s::NamedConstructorAttributeGetter' % (attribute.constructor_type)
+       if attribute.is_named_constructor else 'v8ConstructorAttributeGetter' %}
+  {% endif %}
 {% set setter_callback = 'nullptr' %}
 {% else %}{# regular attributes #}
 {% set getter_callback = '%s::%sAttributeGetterCallback' %
            (v8_class_or_partial, attribute.name) %}
 {% set setter_callback = '%s::%sAttributeSetterCallback' %
            (v8_class_or_partial, attribute.name)
            if attribute.has_setter else 'nullptr' %}
 {% endif %}
 {% set getter_callback_for_main_world =
        '%sForMainWorld' % getter_callback
@@ skipping 33 matching lines @@
 {% filter exposed(attribute.exposed_test) %}
 {% filter secure_context(attribute.secure_context_test) %}
 {% filter runtime_enabled(attribute.runtime_enabled_feature_name) %}
 const V8DOMConfiguration::AccessorConfiguration accessorConfiguration = {{attribute_configuration(attribute)}};
 V8DOMConfiguration::installAccessor(isolate, world, v8::Local<v8::Object>(), prototypeObject, interfaceObject, signature, accessorConfiguration);
 {% endfilter %}{# runtime_enabled #}
 {% endfilter %}{# secure_context #}
 {% endfilter %}{# exposed #}
 {% endfor %}
 {% endmacro %}