Simplify Custom Element constructors to be functions, not wrappers

Source/bindings/v8/CustomElementHelpers.h

Index: Source/bindings/v8/CustomElementHelpers.h
diff --git a/Source/bindings/v8/CustomElementHelpers.h b/Source/bindings/v8/CustomElementHelpers.h
index 4f8ca579fb2429ab52ebab27e8d95e74e7b5a506..b6ed3f7a9c77870648ac09b0e69004f294e8303a 100644
--- a/Source/bindings/v8/CustomElementHelpers.h
+++ b/Source/bindings/v8/CustomElementHelpers.h
@@ -39,11 +39,12 @@
 #include "wtf/Forward.h"
 #include "wtf/HashSet.h"
 #include "wtf/PassRefPtr.h"
+#include "wtf/text/AtomicString.h"
 
 namespace WebCore {
 
-class CustomElementConstructor;
 class CustomElementInvocation;
+class Document;
 class HTMLElement;
 class QualifiedName;
 class SVGElement;
@@ -53,7 +54,7 @@ class CustomElementHelpers {
 public:
     static void didRegisterDefinition(CustomElementDefinition*, ScriptExecutionContext*, const HashSet<Element*>& upgradeCandidates, const ScriptValue& prototypeValue);
 
-    static bool initializeConstructorWrapper(CustomElementConstructor*, const ScriptValue& prototype, ScriptState*);
+    static ScriptValue createConstructor(ScriptState*, const ScriptValue& prototype, Document*, const AtomicString& namespaceURI, const AtomicString& name, const AtomicString& type);
 
     static bool isValidPrototypeParameter(const ScriptValue&, ScriptState*, AtomicString& namespaceURI);
     static bool isValidPrototypeParameter(const ScriptValue&, ScriptState*);