Remove needsShadowTreeWalker flag

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 c13783f933cd4da5d294e512afe969c3a4efcff9..62320d69a0650b60d90be5fa5c2fd077f01de6e5 100644
--- a/Source/core/dom/Node.h
+++ b/Source/core/dom/Node.h
@@ -263,18 +263,12 @@ public:
     virtual bool isCharacterDataNode() const { return false; }
     virtual bool isFrameOwnerElement() const { return false; }
     virtual bool isPluginElement() const { return false; }
-    virtual bool isInsertionPointNode() const { return false; }
 
     bool isDocumentNode() const;
     bool isTreeScope() const { return treeScope()->rootNode() == this; }
     bool isDocumentFragment() const { return getFlag(IsDocumentFragmentFlag); }
     bool isShadowRoot() const { return isDocumentFragment() && isTreeScope(); }
-    bool isInsertionPoint() const { return getFlag(NeedsShadowTreeWalkerFlag) && isInsertionPointNode(); }
-
-    bool needsShadowTreeWalker() const;
-    bool needsShadowTreeWalkerSlow() const;
-    void setNeedsShadowTreeWalker() { setFlag(NeedsShadowTreeWalkerFlag); }
-    void resetNeedsShadowTreeWalker() { setFlag(needsShadowTreeWalkerSlow(), NeedsShadowTreeWalkerFlag); }
+    bool isInsertionPoint() const { return getFlag(IsInsertionPointFlag); }
 
     bool inNamedFlow() const { return getFlag(InNamedFlowFlag); }
     bool hasCustomStyleCallbacks() const { return getFlag(HasCustomStyleCallbacksFlag); }
@@ -735,7 +729,7 @@ private:
         HasScopedHTMLStyleChildFlag = 1 << 22,
         HasEventTargetDataFlag = 1 << 23,
         V8CollectableDuringMinorGCFlag = 1 << 24,
-        NeedsShadowTreeWalkerFlag = 1 << 25,
+        IsInsertionPointFlag = 1 << 25,
         IsInShadowTreeFlag = 1 << 26,
         IsCustomElement = 1 << 27,
 
@@ -755,14 +749,14 @@ protected:
         CreateText = DefaultNodeFlags | IsTextFlag,
         CreateContainer = DefaultNodeFlags | IsContainerFlag, 
         CreateElement = CreateContainer | IsElementFlag, 
-        CreatePseudoElement =  CreateElement | InDocumentFlag | NeedsShadowTreeWalkerFlag,
-        CreateShadowRoot = CreateContainer | IsDocumentFragmentFlag | NeedsShadowTreeWalkerFlag | IsInShadowTreeFlag,
+        CreatePseudoElement =  CreateElement | InDocumentFlag,
+        CreateShadowRoot = CreateContainer | IsDocumentFragmentFlag | IsInShadowTreeFlag,
         CreateDocumentFragment = CreateContainer | IsDocumentFragmentFlag,
         CreateStyledElement = CreateElement | IsStyledElementFlag, 
         CreateHTMLElement = CreateStyledElement | IsHTMLFlag,
         CreateSVGElement = CreateStyledElement | IsSVGFlag,
         CreateDocument = CreateContainer | InDocumentFlag,
-        CreateInsertionPoint = CreateHTMLElement | NeedsShadowTreeWalkerFlag,
+        CreateInsertionPoint = CreateHTMLElement | IsInsertionPointFlag,
         CreateEditingText = CreateText | HasNameOrIsEditingTextFlag,
     };