Pow __proto__, sock :unresolved, and clunk the created callback at once.

Source/bindings/v8/CustomElementHelpers.cpp

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 46 matching lines @@
     // https://bugs.webkit.org/show_bug.cgi?id=108138
     if (!CustomElementHelpers::isFeatureAllowed(context)) {
         v8::Handle<v8::Object> wrapper = V8DOMWrapper::createWrapper(creationContext, &V8HTMLElement::info, impl.get(), isolate);
         if (!wrapper.IsEmpty())
             V8DOMWrapper::associateObjectWithWrapper(impl, &V8HTMLElement::info, wrapper, isolate, WrapperConfiguration::Dependent);
         return wrapper;
     }
 
     CustomElementRegistry* registry = impl->document()->registry();
     RefPtr<CustomElementDefinition> definition = registry->findFor(impl.get());
-    if (!definition)
+    if (!impl->isUpgradedCustomElement() || !definition)
         return createUpgradeCandidateWrapper(impl, creationContext, isolate, createTypeExtensionUpgradeCandidateWrapper);
 
     V8PerContextData* perContextData = V8PerContextData::from(context);
     if (!perContextData)
         return v8::Handle<v8::Object>();
 
     v8::Handle<v8::Object> prototype = perContextData->customElementPrototypes()->get(definition->type()).newLocal(isolate);
     WrapperTypeInfo* typeInfo = CustomElementHelpers::findWrapperType(prototype);
     if (!typeInfo) {
         // FIXME: When can this happen?
@@ skipping 57 matching lines @@
         // Only prototype objects of native-backed types have the extra internal field storing WrapperTypeInfo.
         if (v8PrototypeInternalFieldcount == chainObject->InternalFieldCount())
             return reinterpret_cast<WrapperTypeInfo*>(chainObject->GetAlignedPointerFromInternalField(v8PrototypeTypeIndex));
         chain = chainObject->GetPrototype();
     }
 
     return 0;
 }
 
 } // namespace WebCore