Stop passing dummy ParentDetails to NodeRenderingTraversal::parent()

Source/core/dom/NodeRenderingTraversal.h

Index: Source/core/dom/NodeRenderingTraversal.h
diff --git a/Source/core/dom/NodeRenderingTraversal.h b/Source/core/dom/NodeRenderingTraversal.h
index 455479be8165d7c6e55e5b3be73dd939eb6097f5..33ec60d8378315f8fbfed9fa03443b13546d6363 100644
--- a/Source/core/dom/NodeRenderingTraversal.h
+++ b/Source/core/dom/NodeRenderingTraversal.h
@@ -55,8 +55,7 @@ private:
     const InsertionPoint* m_insertionPoint;
 };
 
-ContainerNode* parent(const Node*);
-ContainerNode* parent(const Node*, ParentDetails*);
+ContainerNode* parent(const Node*, ParentDetails* = 0);
 bool contains(const ContainerNode*, const Node*);
 Node* nextSibling(const Node*);
 Node* previousSibling(const Node*);
@@ -66,12 +65,6 @@ RenderObject* nextSiblingRenderer(const Node*);
 RenderObject* previousSiblingRenderer(const Node*);
 RenderObject* nextInTopLayer(const Element*);
 
-inline ContainerNode* parent(const Node* node)
-{
-    ParentDetails unusedDetails;
-    return parent(node, &unusedDetails);
-}
-
 inline Element* parentElement(const Node* node)
 {
     ParentDetails unusedDetails;