Remove most of 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 16fb5c966e55274ce3267345597fc95e0dad1d42..6b572de9bb53c3a004aacb8a628dd61eedb62f53 100644
--- a/Source/core/dom/Node.h
+++ b/Source/core/dom/Node.h
@@ -375,7 +375,7 @@ public:
     void setIsLink(bool f);
 
     bool hasScopedHTMLStyleChild() const { return getFlag(HasScopedHTMLStyleChildFlag); }
-    void setHasScopedHTMLStyleChild(bool flag) { setFlag(flag, HasScopedHTMLStyleChildFlag); }
+    void setHasScopedHTMLStyleChild(bool flag) { ASSERT(isShadowRoot()); setFlag(flag, HasScopedHTMLStyleChildFlag); }
 
     bool hasEventTargetData() const { return getFlag(HasEventTargetDataFlag); }
     void setHasEventTargetData(bool flag) { setFlag(flag, HasEventTargetDataFlag); }
@@ -651,10 +651,6 @@ public:
     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);