Revert of Remove scoped styles.

Source/core/dom/Node.h

Index: Source/core/dom/Node.h
diff --git a/Source/core/dom/Node.h b/Source/core/dom/Node.h
index 51d1accf0e7b4c753adaceb83538ae051bd5fdb2..e8124911044aa7d0ab540e315d376cb95429ceb1 100644
--- a/Source/core/dom/Node.h
+++ b/Source/core/dom/Node.h
@@ -378,6 +378,9 @@
 
     void setIsLink(bool f);
 
+    bool hasScopedHTMLStyleChild() const { return getFlag(HasScopedHTMLStyleChildFlag); }
+    void setHasScopedHTMLStyleChild(bool flag) { setFlag(flag, HasScopedHTMLStyleChildFlag); }
+
     bool hasEventTargetData() const { return getFlag(HasEventTargetDataFlag); }
     void setHasEventTargetData(bool flag) { setFlag(flag, HasEventTargetDataFlag); }
 
@@ -652,6 +655,10 @@
     void unregisterTransientMutationObserver(MutationObserverRegistration*);
     void notifyMutationObserversNodeWillDetach();
 
+    virtual void registerScopedHTMLStyleChild();
+    virtual void unregisterScopedHTMLStyleChild();
+    size_t numberOfScopedHTMLStyleChildren() const;
+
     unsigned connectedSubframeCount() const;
     void incrementConnectedSubframeCount(unsigned amount = 1);
     void decrementConnectedSubframeCount(unsigned amount = 1);
@@ -717,10 +724,13 @@
         // HTML dir=auto.
         SelfOrAncestorHasDirAutoFlag = 1 << 29,
 
+        // FIXME: Remove <style scoped> support.
+        HasScopedHTMLStyleChildFlag = 1 << 30,
+
         DefaultNodeFlags = IsFinishedParsingChildrenFlag | ChildNeedsStyleRecalcFlag | NeedsReattachStyleChange
     };
 
-    // 2 bits remaining.
+    // 1 bits remaining.
 
     bool getFlag(NodeFlags mask) const { return m_nodeFlags & mask; }
     void setFlag(bool f, NodeFlags mask) const { m_nodeFlags = (m_nodeFlags & ~mask) | (-(int32_t)f & mask); }