Upgrade elements that are created before a custom element definition is registered

Source/core/scripts/make_names.pl

 #!/usr/bin/perl -w
 
 # Copyright (C) 2005, 2006, 2007, 2009 Apple Inc. All rights reserved.
 # Copyright (C) 2009, Julien Chaffraix <jchaffraix@webkit.org>
 # Copyright (C) 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
 # Copyright (C) 2011 Ericsson AB. All rights reserved.
 #
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions
 # are met:
@@ skipping 879 matching lines @@
 
 
 print F "\nPassRefPtr<$parameters{namespace}Element> $parameters{namespace}ElementFactory::create$parameters{namespace}Element(const QualifiedName& qName, Document* document";
 print F ", HTMLFormElement* formElement" if $parameters{namespace} eq "HTML";
 print F ", bool createdByParser)\n{\n";
 
 print F <<END
     if (!document)
         return 0;
 
-    if (CustomElementRegistry::isCustomTagName(qName.localName())) {
+    if (RuntimeEnabledFeatures::customDOMElementsEnabled() && CustomElementRegistry::isCustomTagName(qName.localName())) {
         RefPtr<Element> element = document->ensureCustomElementRegistry()->createCustomTagElement(qName);
         ASSERT(element->is$parameters{namespace}Element());
         return static_pointer_cast<$parameters{namespace}Element>(element.release());
     }
 
     if (!gFunctionMap)
         createFunctionMap();
     if (ConstructorFunction function = gFunctionMap->get(qName.localName().impl())) {
 END
 ;
@@ skipping 348 matching lines @@
     }
 }
 END
 ;
     print F "#endif // $parameters{guardFactoryWith}\n\n" if $parameters{guardFactoryWith};
 
     print F "#endif // V8$parameters{namespace}ElementWrapperFactory_h\n";
 
     close F;
 }