Update remaining NodeTraversal / ElementTraversal methods to take references

Source/core/dom/Text.cpp

Index: Source/core/dom/Text.cpp
diff --git a/Source/core/dom/Text.cpp b/Source/core/dom/Text.cpp
index 56b7314d0d73e36e21da40e59aea3d503b2598f3..23e98bc6db44bcb73dc010653e6c73f3219ea18d 100644
--- a/Source/core/dom/Text.cpp
+++ b/Source/core/dom/Text.cpp
@@ -60,7 +60,7 @@ PassRefPtr<Node> Text::mergeNextSiblingNodesIfPossible()
     // Remove empty text nodes.
     if (!length()) {
         // Care must be taken to get the next node before removing the current node.
-        RefPtr<Node> nextNode(NodeTraversal::nextPostOrder(this));
+        RefPtr<Node> nextNode(NodeTraversal::nextPostOrder(*this));
         remove(IGNORE_EXCEPTION);
         return nextNode.release();
     }
@@ -94,7 +94,7 @@ PassRefPtr<Node> Text::mergeNextSiblingNodesIfPossible()
         nextText->remove(IGNORE_EXCEPTION);
     }
 
-    return NodeTraversal::nextPostOrder(this);
+    return NodeTraversal::nextPostOrder(*this);
 }
 
 PassRefPtr<Text> Text::splitText(unsigned offset, ExceptionState& es)