Avoid calling Node::numberOfScopedHTMLStyleChildren() to check for existence

Source/core/dom/Node.cpp

Index: Source/core/dom/Node.cpp
diff --git a/Source/core/dom/Node.cpp b/Source/core/dom/Node.cpp
index 63dd1935cc7dc1452b07f22e7becee1113658d3c..f917097592686ade40ed6f6628729bd759088a94 100644
--- a/Source/core/dom/Node.cpp
+++ b/Source/core/dom/Node.cpp
@@ -2465,7 +2465,11 @@ void Node::registerScopedHTMLStyleChild()
 void Node::unregisterScopedHTMLStyleChild()
 {
     ASSERT(hasScopedHTMLStyleChild());
-    setHasScopedHTMLStyleChild(numberOfScopedHTMLStyleChildren());
+    for (Element* child = ElementTraversal::firstWithin(*this); child; child = ElementTraversal::nextSibling(*child)) {
+        if (child->hasTagName(HTMLNames::styleTag) && toHTMLStyleElement(child)->isRegisteredAsScoped())
+            return;
+    }
+    setHasScopedHTMLStyleChild(false);
 }
 
 size_t Node::numberOfScopedHTMLStyleChildren() const