Stop passing the root node to node lists traversal functions

Source/core/dom/LiveNodeList.h

Index: Source/core/dom/LiveNodeList.h
diff --git a/Source/core/dom/LiveNodeList.h b/Source/core/dom/LiveNodeList.h
index b9128e47b8b25416789275265b345157934991f5..67c61e488e368460f42fbb1a1ad298a2dec87864 100644
--- a/Source/core/dom/LiveNodeList.h
+++ b/Source/core/dom/LiveNodeList.h
@@ -51,8 +51,8 @@ public:
     // Collection IndexCache API.
     bool canTraverseBackward() const { return true; }
     Element* itemBefore(const Element* previousItem) const;
-    Element* traverseToFirstElement(const ContainerNode& root) const;
-    Element* traverseForwardToOffset(unsigned offset, Element& currentNode, unsigned& currentOffset, const ContainerNode& root) const;
+    Element* traverseToFirstElement() const;
+    Element* traverseForwardToOffset(unsigned offset, Element& currentNode, unsigned& currentOffset) const;
 
 private:
     virtual Node* virtualOwnerNode() const OVERRIDE FINAL;