Remove extension check from CustomElementRegistry.

sky/engine/core/dom/custom/CustomElementException.cpp

 /*
  * Copyright (C) 2013 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:
  *
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 26 matching lines @@
 namespace blink {
 
 String CustomElementException::preamble(const AtomicString& type)
 {
     return "Registration failed for type '" + type + "'. ";
 }
 
 void CustomElementException::throwException(Reason reason, const AtomicString& type, ExceptionState& exceptionState)
 {
     switch (reason) {
-    case CannotRegisterFromExtension:
-        exceptionState.throwDOMException(NotSupportedError, preamble(type) + "Elements cannot be registered from extensions.");
-        return;
-
     case ConstructorPropertyNotConfigurable:
         exceptionState.throwDOMException(NotSupportedError, preamble(type) + "Prototype constructor property is not configurable.");
         return;
 
     case ContextDestroyedCheckingPrototype:
         exceptionState.throwDOMException(InvalidStateError, preamble(type) + "The context is no longer valid.");
         return;
 
     case ContextDestroyedCreatingCallbacks:
         exceptionState.throwDOMException(InvalidStateError, preamble(type) + "The context is no longer valid.");
@@ skipping 25 matching lines @@
 
     case TypeAlreadyRegistered:
         exceptionState.throwDOMException(NotSupportedError, preamble(type) + "A type with that name is already registered.");
         return;
     }
 
     ASSERT_NOT_REACHED();
 }
 
 } // namespace blink