Remove ENABLE_CUSTOM_ELEMENTS compile time flag

Source/bindings/scripts/CodeGeneratorV8.pm

 # Copyright (C) 2005, 2006 Nikolas Zimmermann <zimmermann@kde.org>
 # Copyright (C) 2006 Anders Carlsson <andersca@mac.com>
 # Copyright (C) 2006 Samuel Weinig <sam.weinig@gmail.com>
 # Copyright (C) 2006 Alexey Proskuryakov <ap@webkit.org>
 # Copyright (C) 2006 Apple Computer, Inc.
 # Copyright (C) 2007, 2008, 2009, 2012 Google Inc.
 # Copyright (C) 2009 Cameron McCormack <cam@mcc.id.au>
 # Copyright (C) Research In Motion Limited 2010. All rights reserved.
 # Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
 # Copyright (C) 2012 Ericsson AB. All rights reserved.
@@ skipping 1357 matching lines @@
 sub GenerateCustomElementInvocationScopeIfNeeded
 {
     my $code = "";
     my $ext = shift;
 
     if ($ext->{"DeliverCustomElementCallbacks"}) {
         if ($ext->{"Reflect"}) {
             die "IDL error: [Reflect] and [DeliverCustomElementCallbacks] cannot coexist yet";
         }
 
-        AddToImplIncludes("CustomElementRegistry.h", "CUSTOM_ELEMENTS");
+        AddToImplIncludes("CustomElementRegistry.h");
         $code .= <<END;
-#if ENABLE(CUSTOM_ELEMENTS)
     CustomElementRegistry::CallbackDeliveryScope deliveryScope;
-#endif
 END
     }
     return $code;
 }
 
 sub GenerateNormalAttrSetterCallback
 {
     my $attribute = shift;
     my $interface = shift;
     my $forMainWorldSuffix = shift;
@@ skipping 3464 matching lines @@
 
 sub GetPassRefPtrType
 {
     my $v8InterfaceName = shift;
 
     my $angleBracketSpace = $v8InterfaceName =~ />$/ ? " " : "";
     return "PassRefPtr<${v8InterfaceName}${angleBracketSpace}>";
 }
 
 1;