Make createNodeIterator() and createTreeWalker() accept default arguments.

Source/core/dom/Traversal.cpp

Index: Source/core/dom/Traversal.cpp
diff --git a/Source/core/dom/Traversal.cpp b/Source/core/dom/Traversal.cpp
index 207480c3ad164c06f99ff402d33a363563948d8a..a9262cc934d7d70b0c93f1e1834b5885f42120a6 100644
--- a/Source/core/dom/Traversal.cpp
+++ b/Source/core/dom/Traversal.cpp
@@ -30,18 +30,15 @@
 
 namespace WebCore {
 
-Traversal::Traversal(PassRefPtr<Node> rootNode, unsigned whatToShow, PassRefPtr<NodeFilter> nodeFilter, bool expandEntityReferences)
+Traversal::Traversal(PassRefPtr<Node> rootNode, unsigned whatToShow, PassRefPtr<NodeFilter> nodeFilter)
     : m_root(rootNode)
     , m_whatToShow(whatToShow)
     , m_filter(nodeFilter)
-    , m_expandEntityReferences(expandEntityReferences)
 {
 }
 
 short Traversal::acceptNode(ScriptState* state, Node* node) const
 {
-    // FIXME: To handle XML properly we would have to check m_expandEntityReferences.
-
     // The bit twiddling here is done to map DOM node types, which are given as integers from
     // 1 through 14, to whatToShow bit masks.
     if (!(((1 << (node->nodeType() - 1)) & m_whatToShow)))