Remove ENABLE_CUSTOM_ELEMENTS compile time flag

Source/core/dom/Element.cpp

Index: Source/core/dom/Element.cpp
diff --git a/Source/core/dom/Element.cpp b/Source/core/dom/Element.cpp
index fa7fe10a406ecfc89725cbd027a00d416d1504b8..556e78db7ad8eac6ec6d4107e79b72dc72b6ca81 100644
--- a/Source/core/dom/Element.cpp
+++ b/Source/core/dom/Element.cpp
@@ -877,12 +877,10 @@ void Element::attributeChanged(const QualifiedName& name, const AtomicString& ne
 
 inline void Element::attributeChangedFromParserOrByCloning(const QualifiedName& name, const AtomicString& newValue, AttributeModificationReason reason)
 {
-#if ENABLE(CUSTOM_ELEMENTS)
     if (name == isAttr) {
         if (CustomElementRegistry* registry = document()->registry())
             registry->didGiveTypeExtension(this);
     }
-#endif
     attributeChanged(name, newValue, reason);
 }