Remove ENABLE_CUSTOM_ELEMENTS compile time flag

Source/core/dom/Document.idl

Index: Source/core/dom/Document.idl
diff --git a/Source/core/dom/Document.idl b/Source/core/dom/Document.idl
index d591f5dfe9b9d6a4704a1635c3e7aff29eb33986..f0baf2312952752fc29f80e54a322330572bc2d6 100644
--- a/Source/core/dom/Document.idl
+++ b/Source/core/dom/Document.idl
@@ -279,12 +279,10 @@
     [ReturnNewObject, EnabledAtRuntime=touch, Custom, RaisesException] TouchList createTouchList();
 #endif
 
-#if defined(ENABLE_CUSTOM_ELEMENTS) && ENABLE_CUSTOM_ELEMENTS
-    [EnabledAtRuntime=customDOMElements, Conditional=CUSTOM_ELEMENTS, ImplementedAs=registerElement, CallWith=ScriptState, DeliverCustomElementCallbacks, RaisesException] CustomElementConstructor webkitRegister(DOMString name, optional Dictionary options);
+    [EnabledAtRuntime=customDOMElements, ImplementedAs=registerElement, CallWith=ScriptState, DeliverCustomElementCallbacks, RaisesException] CustomElementConstructor webkitRegister(DOMString name, optional Dictionary options);
     [ReturnNewObject, DeliverCustomElementCallbacks, PerWorldBindings, RaisesException] Element createElement(DOMString localName, [TreatNullAs=NullString] DOMString typeExtension);
     [ReturnNewObject, DeliverCustomElementCallbacks, RaisesException] Element createElementNS([TreatNullAs=NullString] DOMString namespaceURI, DOMString qualifiedName,
                             [TreatNullAs=NullString] DOMString typeExtension);
-#endif
 
     // Page visibility API.
     readonly attribute DOMString webkitVisibilityState;