Fix V8 bindings for named constructors to set prototype object correctly

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

Index: third_party/WebKit/Source/bindings/templates/attributes.cpp.tmpl
diff --git a/third_party/WebKit/Source/bindings/templates/attributes.cpp.tmpl b/third_party/WebKit/Source/bindings/templates/attributes.cpp.tmpl
index bfa875a0981baab255ebb5ccf8edc877c3d974da..c07138369d931bd3d4507073b66af6ed7a23efb9 100644
--- a/third_party/WebKit/Source/bindings/templates/attributes.cpp.tmpl
+++ b/third_party/WebKit/Source/bindings/templates/attributes.cpp.tmpl
@@ -423,10 +423,14 @@ const v8::FunctionCallbackInfo<v8::Value>& info
 {% macro attribute_configuration(attribute) %}
 {% from 'utilities.cpp.tmpl' import property_location %}
 {% if attribute.constructor_type %}
-{% set getter_callback =
-       '%sV8Internal::%sConstructorGetterCallback' % (cpp_class_or_partial, attribute.name)
-       if attribute.needs_constructor_getter_callback else
-       'v8ConstructorAttributeGetter' %}
+  {% if attribute.needs_constructor_getter_callback %}
+    {% set getter_callback =
+           '%sV8Internal::%sConstructorGetterCallback' % (cpp_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 = '0' %}
 {% else %}{# regular attributes #}
 {% set getter_callback = '%sV8Internal::%sAttributeGetterCallback' %
@@ -444,7 +448,7 @@ const v8::FunctionCallbackInfo<v8::Value>& info
 {% set wrapper_type_info =
        'const_cast<WrapperTypeInfo*>(&V8%s::wrapperTypeInfo)' %
            attribute.constructor_type
-       if attribute.constructor_type else '0' %}
+       if attribute.constructor_type and not attribute.is_named_constructor else '0' %}
 {% set property_attribute = 'static_cast<v8::PropertyAttribute>(%s)' %
                             ' | '.join(attribute.property_attributes) %}
 {% set cached_accessor_callback =