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

Source/core/editing/EditingStyle.cpp

Index: Source/core/editing/EditingStyle.cpp
diff --git a/Source/core/editing/EditingStyle.cpp b/Source/core/editing/EditingStyle.cpp
index 358819603f07d364642bd2b3b67c6ba9b47add9a..efc991df3e095eda2783e1b0d12c75ab728041f3 100644
--- a/Source/core/editing/EditingStyle.cpp
+++ b/Source/core/editing/EditingStyle.cpp
@@ -712,7 +712,7 @@ TriState EditingStyle::triStateOfStyle(const VisibleSelection& selection) const
 
     TriState state = FalseTriState;
     bool nodeIsStart = true;
-    for (Node* node = selection.start().deprecatedNode(); node; node = NodeTraversal::next(node)) {
+    for (Node* node = selection.start().deprecatedNode(); node; node = NodeTraversal::next(*node)) {
         if (node->renderer() && node->rendererIsEditable()) {
             RefPtr<CSSComputedStyleDeclaration> nodeStyle = CSSComputedStyleDeclaration::create(node);
             if (nodeStyle) {
@@ -1300,7 +1300,7 @@ WritingDirection EditingStyle::textDirectionForSelection(const VisibleSelection&
 
         ASSERT(end.document());
         Node* pastLast = Range::create(*end.document(), position.parentAnchoredEquivalent(), end.parentAnchoredEquivalent())->pastLastNode();
-        for (Node* n = node; n && n != pastLast; n = NodeTraversal::next(n)) {
+        for (Node* n = node; n && n != pastLast; n = NodeTraversal::next(*n)) {
             if (!n->isStyledElement())
                 continue;