Have NodeTraversal::previous*() take a reference

Source/core/dom/ElementTraversal.h

Index: Source/core/dom/ElementTraversal.h
diff --git a/Source/core/dom/ElementTraversal.h b/Source/core/dom/ElementTraversal.h
index 0e85492cf15ef62cefc0a11e6cab7d87224f3894..5550babbbdbd07df477a71550e9b4d386009cbee 100644
--- a/Source/core/dom/ElementTraversal.h
+++ b/Source/core/dom/ElementTraversal.h
@@ -49,12 +49,12 @@ Element* nextSkippingChildren(const ContainerNode*);
 Element* nextSkippingChildren(const ContainerNode*, const Node* stayWithin);
 
 // Pre-order traversal including the pseudo-elements.
-Element* previousIncludingPseudo(const Node*, const Node* stayWithin = 0);
+Element* previousIncludingPseudo(const Node&, const Node* stayWithin = 0);
 Element* nextIncludingPseudo(const Node*, const Node* stayWithin = 0);
 Element* nextIncludingPseudoSkippingChildren(const Node*, const Node* stayWithin = 0);
 
 // Utility function to traverse only the element and pseudo-element siblings of a node.
-Element* pseudoAwarePreviousSibling(const Node*);
+Element* pseudoAwarePreviousSibling(const Node&);
 
 template <class NodeType>
 inline Element* firstElementWithinTemplate(NodeType* current)
@@ -112,11 +112,11 @@ inline Element* traverseNextElementSkippingChildrenTemplate(NodeType* current, c
 inline Element* nextSkippingChildren(const ContainerNode* current, const Node* stayWithin) { return traverseNextElementSkippingChildrenTemplate(current, stayWithin); }
 inline Element* nextSkippingChildren(const Node* current, const Node* stayWithin) { return traverseNextElementSkippingChildrenTemplate(current, stayWithin); }
 
-inline Element* previousIncludingPseudo(const Node* current, const Node* stayWithin)
+inline Element* previousIncludingPseudo(const Node& current, const Node* stayWithin)
 {
     Node* node = NodeTraversal::previousIncludingPseudo(current, stayWithin);
     while (node && !node->isElementNode())
-        node = NodeTraversal::previousIncludingPseudo(node, stayWithin);
+        node = NodeTraversal::previousIncludingPseudo(*node, stayWithin);
     return toElement(node);
 }
 
@@ -136,9 +136,9 @@ inline Element* nextIncludingPseudoSkippingChildren(const Node* current, const N
     return toElement(node);
 }
 
-inline Element* pseudoAwarePreviousSibling(const Node* current)
+inline Element* pseudoAwarePreviousSibling(const Node& current)
 {
-    Node* node = current->pseudoAwarePreviousSibling();
+    Node* node = current.pseudoAwarePreviousSibling();
     while (node && !node->isElementNode())
         node = node->pseudoAwarePreviousSibling();
     return toElement(node);