Stop passing the root node to node lists traversal functions

Source/core/html/HTMLCollection.h

Index: Source/core/html/HTMLCollection.h
diff --git a/Source/core/html/HTMLCollection.h b/Source/core/html/HTMLCollection.h
index 86f7dd1ac272ae9b828d4a6e45438443d249d5ed..0b1601da4db92e05041f1c58827c0c1201decc90 100644
--- a/Source/core/html/HTMLCollection.h
+++ b/Source/core/html/HTMLCollection.h
@@ -59,8 +59,8 @@ public:
     // CollectionIndexCache API.
     bool canTraverseBackward() const { return !overridesItemAfter(); }
     Element* itemBefore(const Element* previousItem) const;
-    Element* traverseToFirstElement(const ContainerNode& root) const;
-    Element* traverseForwardToOffset(unsigned offset, Element& currentElement, unsigned& currentOffset, const ContainerNode& root) const;
+    Element* traverseToFirstElement() const;
+    Element* traverseForwardToOffset(unsigned offset, Element& currentElement, unsigned& currentOffset) const;
 
 protected:
     HTMLCollection(ContainerNode& base, CollectionType, ItemAfterOverrideType);
@@ -108,7 +108,7 @@ protected:
     }
 
 private:
-    Element* traverseNextElement(Element& previous, const ContainerNode& root) const;
+    Element* traverseNextElement(Element& previous) const;
 
     void invalidateIdNameCacheMaps(Document* oldDocument = 0) const
     {