Revert of Remove scoped styles.

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 50b797c9e4646a4e96eaca59b809395701149861..00d15ffe33f87e86972771db485079ebb87c8f66 100644
--- a/Source/core/dom/Node.cpp
+++ b/Source/core/dom/Node.cpp
@@ -2464,6 +2464,28 @@
     return StaticNodeList::adopt(filteredInsertionPoints);
 }
 
+void Node::registerScopedHTMLStyleChild()
+{
+    setHasScopedHTMLStyleChild(true);
+}
+
+void Node::unregisterScopedHTMLStyleChild()
+{
+    ASSERT(hasScopedHTMLStyleChild());
+    setHasScopedHTMLStyleChild(numberOfScopedHTMLStyleChildren());
+}
+
+size_t Node::numberOfScopedHTMLStyleChildren() const
+{
+    size_t count = 0;
+    for (HTMLStyleElement* style = Traversal<HTMLStyleElement>::firstChild(*this); style; style = Traversal<HTMLStyleElement>::nextSibling(*style)) {
+        if (style->isRegisteredAsScoped())
+            ++count;
+    }
+
+    return count;
+}
+
 void Node::setFocus(bool flag)
 {
     document().userActionElements().setFocused(this, flag);