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 063c4fd4ee7d7fc872fb604b541e39a950be54e9..1df0a473f1ad3efe3e8244c9b899fbcf77933b1c 100644
--- a/Source/core/dom/Document.cpp
+++ b/Source/core/dom/Document.cpp
@@ -66,7 +66,6 @@
 #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"
@@ -828,16 +827,16 @@ 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);