Have ElementTraversal / NodeTraversal's next() methods take a reference

Source/core/html/HTMLNameCollection.cpp

Index: Source/core/html/HTMLNameCollection.cpp
diff --git a/Source/core/html/HTMLNameCollection.cpp b/Source/core/html/HTMLNameCollection.cpp
index 0706e81cb23f32197478caca3cfe5b1fb0b5f20b..47e30ed892adb4f0f1308be47c59904e1f54093c 100644
--- a/Source/core/html/HTMLNameCollection.cpp
+++ b/Source/core/html/HTMLNameCollection.cpp
@@ -56,9 +56,9 @@ Element* HTMLNameCollection::virtualItemAfter(unsigned& offsetInArray, Element*
     if (!previous)
         current = ElementTraversal::firstWithin(ownerNode());
     else
-        current = ElementTraversal::next(previous, ownerNode());
+        current = ElementTraversal::next(*previous, ownerNode());
 
-    for (; current; current = ElementTraversal::next(current, ownerNode())) {
+    for (; current; current = ElementTraversal::next(*current, ownerNode())) {
         switch (type()) {
         case WindowNamedItems:
             // find only images, forms, applets, embeds and objects by name,