Remove HTMLShadowElement.

sky/engine/core/dom/shadow/ShadowRoot.h

Index: sky/engine/core/dom/shadow/ShadowRoot.h
diff --git a/sky/engine/core/dom/shadow/ShadowRoot.h b/sky/engine/core/dom/shadow/ShadowRoot.h
index ef3185b10f77f45d8e3c0357bce4bf839dc6a53f..162603470eb1932ab24079b041cbf8273dabd272 100644
--- a/sky/engine/core/dom/shadow/ShadowRoot.h
+++ b/sky/engine/core/dom/shadow/ShadowRoot.h
@@ -38,7 +38,6 @@ namespace blink {
 class Document;
 class ElementShadow;
 class ExceptionState;
-class HTMLShadowElement;
 class InsertionPoint;
 class ShadowRootRareData;
 class StyleSheetList;
@@ -74,20 +73,14 @@ public:
     void registerScopedHTMLStyleChild();
     void unregisterScopedHTMLStyleChild();
 
-    bool containsShadowElements() const;
     bool containsContentElements() const;
-    bool containsInsertionPoints() const { return containsShadowElements() || containsContentElements(); }
+    bool containsInsertionPoints() const { return containsContentElements(); }
     bool containsShadowRoots() const;
 
-    unsigned descendantShadowElementCount() const;
-
     // For Internals, don't use this.
     unsigned childShadowRootCount() const;
     unsigned numberOfStyles() const { return m_numberOfStyles; }
 
-    HTMLShadowElement* shadowInsertionPointOfYoungerShadowRoot() const;
-    void setShadowInsertionPointOfYoungerShadowRoot(PassRefPtr<HTMLShadowElement>);
-
     void didAddInsertionPoint(InsertionPoint*);
     void didRemoveInsertionPoint(InsertionPoint*);
     const Vector<RefPtr<InsertionPoint> >& descendantInsertionPoints();
@@ -116,8 +109,6 @@ private:
     virtual void dispose() override;
 #endif
 
-    virtual void childrenChanged(const ChildrenChange&) override;
-
     ShadowRootRareData* ensureShadowRootRareData();
 
     void addChildShadowRoot();