Upgrade elements that are created before a custom element definition is registered

Source/core/dom/Element.cpp

Index: Source/core/dom/Element.cpp
diff --git a/Source/core/dom/Element.cpp b/Source/core/dom/Element.cpp
index d23d94347cb31198d50b792823a59d362b166b1c..1ea95155d3a19aa7883d153b17e3c14e86fbdfb3 100644
--- a/Source/core/dom/Element.cpp
+++ b/Source/core/dom/Element.cpp
@@ -879,9 +879,8 @@ void Element::attributeChanged(const QualifiedName& name, const AtomicString& ne
 
 inline void Element::attributeChangedFromParserOrByCloning(const QualifiedName& name, const AtomicString& newValue, AttributeModificationReason reason)
 {
-    if (name == isAttr) {
-        if (CustomElementRegistry* registry = document()->registry())
-            registry->didGiveTypeExtension(this);
+    if (RuntimeEnabledFeatures::customDOMElementsEnabled() && name == isAttr) {
+        document()->ensureCustomElementRegistry()->didGiveTypeExtension(this, newValue);
     }
     attributeChanged(name, newValue, reason);
 }