Simplify Custom Element constructors to be functions, not wrappers

Source/core/dom/Document.cpp

Index: Source/core/dom/Document.cpp
diff --git a/Source/core/dom/Document.cpp b/Source/core/dom/Document.cpp
index 79ac970ad4312b8daa54d74ae572be22cf21b1cf..9b68573fb1ee258977fa443a30d917e964f1cbb4 100644
--- a/Source/core/dom/Document.cpp
+++ b/Source/core/dom/Document.cpp
@@ -56,7 +56,6 @@
 #include "core/dom/CDATASection.h"
 #include "core/dom/Comment.h"
 #include "core/dom/ContextFeatures.h"
-#include "core/dom/CustomElementConstructor.h"
 #include "core/dom/CustomElementRegistry.h"
 #include "core/dom/DOMImplementation.h"
 #include "core/dom/DOMNamedFlowCollection.h"
@@ -831,16 +830,16 @@ PassRefPtr<Element> Document::createElementNS(const AtomicString& namespaceURI,
     return element;
 }
 
-PassRefPtr<CustomElementConstructor> Document::registerElement(WebCore::ScriptState* state, const AtomicString& name, ExceptionCode& ec)
+ScriptValue Document::registerElement(WebCore::ScriptState* state, const AtomicString& name, ExceptionCode& ec)
 {
     return registerElement(state, name, Dictionary(), ec);
 }
 
-PassRefPtr<CustomElementConstructor> Document::registerElement(WebCore::ScriptState* state, const AtomicString& name, const Dictionary& options, ExceptionCode& ec)
+ScriptValue Document::registerElement(WebCore::ScriptState* state, const AtomicString& name, const Dictionary& options, ExceptionCode& ec)
 {
     if (!isHTMLDocument() && !isXHTMLDocument()) {
         ec = NOT_SUPPORTED_ERR;
-        return 0;
+        return ScriptValue();
     }
 
     return ensureCustomElementRegistry()->registerElement(state, name, options, ec);