Remove needsShadowTreeWalker flag

Source/core/dom/shadow/InsertionPoint.h

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 77 matching lines @@
 
     static const CSSSelectorList& emptySelectorList();
 
 protected:
     InsertionPoint(const QualifiedName&, Document*);
     virtual bool rendererIsNeeded(const NodeRenderingContext&) OVERRIDE;
     virtual void childrenChanged(bool changedByParser, Node* beforeChange, Node* afterChange, int childCountDelta) OVERRIDE;
     virtual InsertionNotificationRequest insertedInto(ContainerNode*) OVERRIDE;
     virtual void removedFrom(ContainerNode*) OVERRIDE;
     virtual void parseAttribute(const QualifiedName&, const AtomicString&) OVERRIDE;
-    virtual bool isInsertionPointNode() const OVERRIDE { return true; }
 
 private:
 
     ContentDistribution m_distribution;
     bool m_registeredWithShadowRoot;
 };
 
 inline InsertionPoint* toInsertionPoint(Node* node)
 {
     ASSERT_WITH_SECURITY_IMPLICATION(!node || node->isInsertionPoint());
@@ skipping 50 matching lines @@
     return 0;
 }
 
 InsertionPoint* resolveReprojection(const Node*);
 
 void collectInsertionPointsWhereNodeIsDistributed(const Node*, Vector<InsertionPoint*, 8>& results);
 
 } // namespace WebCore
 
 #endif // InsertionPoint_h