Creating custom element should not be case sensitive

Source/core/dom/Document.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  *           (C) 2006 Alexey Proskuryakov (ap@webkit.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2011, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (C) 2008, 2009, 2011, 2012 Google Inc. All rights reserved.
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) Research In Motion Limited 2010-2011. All rights reserved.
@@ skipping 740 matching lines @@
 
     return &domWindow()->location();
 }
 
 void Document::childrenChanged(const ChildrenChange& change)
 {
     ContainerNode::childrenChanged(change);
     m_documentElement = ElementTraversal::firstWithin(*this);
 }
 
+AtomicString Document::convertLocalName(const AtomicString& name)
+{
+    return isHTMLDocument() ? name.lower() : name;
+}
+
 PassRefPtrWillBeRawPtr<Element> Document::createElement(const AtomicString& name, ExceptionState& exceptionState)
 {
     if (!isValidName(name)) {
         exceptionState.throwDOMException(InvalidCharacterError, "The tag name provided ('" + name + "') is not a valid name.");
         return nullptr;
     }
 
     if (isXHTMLDocument() || isHTMLDocument())
-        return HTMLElementFactory::createHTMLElement(isHTMLDocument() ? name.lower() : name, *this, 0, false);
+        return HTMLElementFactory::createHTMLElement(convertLocalName(name), *this, 0, false);
 
     return Element::create(QualifiedName(nullAtom, name, nullAtom), this);
 }
 
 PassRefPtrWillBeRawPtr<Element> Document::createElement(const AtomicString& localName, const AtomicString& typeExtension, ExceptionState& exceptionState)
 {
     if (!isValidName(localName)) {
         exceptionState.throwDOMException(InvalidCharacterError, "The tag name provided ('" + localName + "') is not a valid name.");
         return nullptr;
     }
 
     RefPtrWillBeRawPtr<Element> element;
 
     if (CustomElement::isValidName(localName) && registrationContext()) {
-        element = registrationContext()->createCustomTagElement(*this, QualifiedName(nullAtom, localName, xhtmlNamespaceURI));
+        element = registrationContext()->createCustomTagElement(*this, QualifiedName(nullAtom, convertLocalName(localName), xhtmlNamespaceURI));
     } else {
         element = createElement(localName, exceptionState);
         if (exceptionState.hadException())
             return nullptr;
     }
 
     if (!typeExtension.isEmpty())
         CustomElementRegistrationContext::setIsAttributeAndTypeExtension(element.get(), typeExtension);
 
     return element.release();
@@ skipping 5088 matching lines @@
 using namespace blink;
 void showLiveDocumentInstances()
 {
     WeakDocumentSet& set = liveDocumentSet();
     fprintf(stderr, "There are %u documents currently alive:\n", set.size());
     for (WeakDocumentSet::const_iterator it = set.begin(); it != set.end(); ++it) {
         fprintf(stderr, "- Document %p URL: %s\n", *it, (*it)->url().string().utf8().data());
     }
 }
 #endif