Remove extension check from CustomElementRegistry.

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

Index: sky/engine/core/dom/custom/CustomElementRegistry.cpp
diff --git a/sky/engine/core/dom/custom/CustomElementRegistry.cpp b/sky/engine/core/dom/custom/CustomElementRegistry.cpp
index ab3839d83c127db291f79e8768037c04e9c6ff99..339c2c8253fb132b706d2acbef3bd45d7aea8841 100644
--- a/sky/engine/core/dom/custom/CustomElementRegistry.cpp
+++ b/sky/engine/core/dom/custom/CustomElementRegistry.cpp
@@ -69,11 +69,6 @@ CustomElementDefinition* CustomElementRegistry::registerElement(Document* docume
 
     AtomicString type = userSuppliedName.lower();
 
-    if (!constructorBuilder->isFeatureAllowed()) {
-        CustomElementException::throwException(CustomElementException::CannotRegisterFromExtension, type, exceptionState);
-        return 0;
-    }
-
     if (!CustomElement::isValidName(type, validNames)) {
         CustomElementException::throwException(CustomElementException::InvalidName, type, exceptionState);
         return 0;