Fix V8 bindings for named constructors to set prototype object correctly

third_party/WebKit/Source/bindings/templates/interface.h.tmpl

 {% filter format_blink_cpp_source_code %}
 
 {% include 'copyright_block.txt' %}
 #ifndef {{v8_class}}_h
 #define {{v8_class}}_h
 
 {% for filename in header_includes %}
 #include "{{filename}}"
 {% endfor %}
 
 namespace blink {
 
 {% if has_event_constructor %}
 class Dictionary;
 {% endif %}
 {% if origin_trial_attributes %}
 class ScriptState;
 {% endif %}
 {% if named_constructor %}
 class {{v8_class}}Constructor {
   STATIC_ONLY({{v8_class}}Constructor);
  public:
   static v8::Local<v8::FunctionTemplate> domTemplate(v8::Isolate*, const DOMWrapperWorld&);
+  static void NamedConstructorAttributeGetter(v8::Local<v8::Name> propertyName, const v8::PropertyCallbackInfo<v8::Value>& info);
   {{exported}}static const WrapperTypeInfo wrapperTypeInfo;
 };
 
 {% endif %}
 class {{v8_class}} {
   STATIC_ONLY({{v8_class}});
  public:
   {% if is_array_buffer_or_view %}
   {{exported}}static {{cpp_class}}* toImpl(v8::Local<v8::Object> object);
   {% else %}
@@ skipping 246 matching lines @@
 template <>
 struct V8TypeOf<{{cpp_class}}> {
   typedef {{v8_class}} Type;
 };
 
 }  // namespace blink
 
 #endif  // {{v8_class}}_h
 
 {% endfilter %}{# format_blink_cpp_source_code #}