Remove HTMLShadowElement.

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

Index: sky/engine/core/dom/shadow/InsertionPoint.h
diff --git a/sky/engine/core/dom/shadow/InsertionPoint.h b/sky/engine/core/dom/shadow/InsertionPoint.h
index 13c4878be432f87c020cf0721867bdda8f8df084..10677f309f71b8fe665ca619dc6850d4fdc7630a 100644
--- a/sky/engine/core/dom/shadow/InsertionPoint.h
+++ b/sky/engine/core/dom/shadow/InsertionPoint.h
@@ -48,7 +48,6 @@ public:
     bool isActive() const;
     bool canBeActive() const;
 
-    bool isShadowInsertionPoint() const;
     bool isContentInsertionPoint() const;
 
     PassRefPtr<StaticNodeList> getDistributedNodes();
@@ -91,11 +90,6 @@ inline bool isActiveInsertionPoint(const Node& node)
     return node.isInsertionPoint() && toInsertionPoint(node).isActive();
 }
 
-inline bool isActiveShadowInsertionPoint(const Node& node)
-{
-    return node.isInsertionPoint() && toInsertionPoint(node).isShadowInsertionPoint();
-}
-
 inline ElementShadow* shadowWhereNodeCanBeDistributed(const Node& node)
 {
     Node* parent = node.parentNode();