Revert of Remove scoped styles.

Source/core/html/HTMLStyleElement.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2003, 2010 Apple Inc. ALl rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
@@ skipping 24 matching lines @@
 typedef EventSender<HTMLStyleElement> StyleEventSender;
 
 class HTMLStyleElement FINAL : public HTMLElement, private StyleElement {
     WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(HTMLStyleElement);
 public:
     static PassRefPtrWillBeRawPtr<HTMLStyleElement> create(Document&, bool createdByParser);
     virtual ~HTMLStyleElement();
 
     void setType(const AtomicString&);
 
+    bool scoped() const;
+    void setScoped(bool);
     ContainerNode* scopingNode();
+    bool isRegisteredAsScoped() const
+    {
+        // Note: We cannot rely on the 'scoped' attribute still being present when this method is invoked.
+        // Therefore we cannot rely on scoped()!
+        if (m_scopedStyleRegistrationState == NotRegistered)
+            return false;
+        return true;
+    }
+
+    bool isRegisteredInShadowRoot() const
+    {
+        return m_scopedStyleRegistrationState == RegisteredInShadowRoot;
+    }
 
     using StyleElement::sheet;
 
     bool disabled() const;
     void setDisabled(bool);
 
     void dispatchPendingEvent(StyleEventSender*);
     static void dispatchPendingLoadEvents();
 
     virtual void trace(Visitor*) OVERRIDE;
@@ skipping 10 matching lines @@
 
     virtual void finishParsingChildren() OVERRIDE;
 
     virtual bool sheetLoaded() OVERRIDE { return StyleElement::sheetLoaded(document()); }
     virtual void notifyLoadedSheetAndAllCriticalSubresources(bool errorOccurred) OVERRIDE;
     virtual void startLoadingDynamicSheet() OVERRIDE { StyleElement::startLoadingDynamicSheet(document()); }
 
     virtual const AtomicString& media() const OVERRIDE;
     virtual const AtomicString& type() const OVERRIDE;
 
+    void scopedAttributeChanged(bool);
+    void registerWithScopingNode(bool);
+    void unregisterWithScopingNode(ContainerNode*);
+
     bool m_firedLoad;
     bool m_loadedSheet;
+
+    enum ScopedStyleRegistrationState {
+        NotRegistered,
+        RegisteredAsScoped,
+        RegisteredInShadowRoot
+    };
+    ScopedStyleRegistrationState m_scopedStyleRegistrationState;
 };
 
 } //namespace
 
 #endif