Have HTMLElements / SVGElements constructors take a Document reference in argument

Source/core/dom/CustomElementRegistrationContext.cpp

Index: Source/core/dom/CustomElementRegistrationContext.cpp
diff --git a/Source/core/dom/CustomElementRegistrationContext.cpp b/Source/core/dom/CustomElementRegistrationContext.cpp
index 4cc4e68a86426c33c22e1e47b35d9762fca8f80a..6c4133f970275e819a8bed3d10334ea6e8a9b850 100644
--- a/Source/core/dom/CustomElementRegistrationContext.cpp
+++ b/Source/core/dom/CustomElementRegistrationContext.cpp
@@ -58,13 +58,10 @@ void CustomElementRegistrationContext::registerElement(Document* document, Custo
         didResolveElement(definition, *it);
 }
 
-PassRefPtr<Element> CustomElementRegistrationContext::createCustomTagElement(Document* document, const QualifiedName& tagName, CreationMode mode)
+PassRefPtr<Element> CustomElementRegistrationContext::createCustomTagElement(Document& document, const QualifiedName& tagName, CreationMode mode)
 {
     ASSERT(CustomElement::isValidName(tagName.localName()));
 
-    if (!document)
-        return 0;
-
     RefPtr<Element> element;
 
     if (HTMLNames::xhtmlNamespaceURI == tagName.namespaceURI()) {
@@ -73,7 +70,7 @@ PassRefPtr<Element> CustomElementRegistrationContext::createCustomTagElement(Doc
         element = SVGUnknownElement::create(tagName, document);
     } else {
         // XML elements are not custom elements, so return early.
-        return Element::create(tagName, document);
+        return Element::create(tagName, &document);
     }
 
     element->setCustomElementState(mode == CreatedByParser ? Element::WaitingForParser : Element::WaitingForUpgrade);