Move matching Element traversal functions from LiveNodeListBase to ElementTraversal

Source/core/dom/LiveNodeList.cpp

Index: Source/core/dom/LiveNodeList.cpp
diff --git a/Source/core/dom/LiveNodeList.cpp b/Source/core/dom/LiveNodeList.cpp
index b437e68908ef5f953b87c4a67035faba2adf0f00..94f300eb63a5da533d7edd5a9fae1fa08cc299bb 100644
--- a/Source/core/dom/LiveNodeList.cpp
+++ b/Source/core/dom/LiveNodeList.cpp
@@ -25,10 +25,24 @@
 
 namespace blink {
 
-static inline bool isMatchingElement(const LiveNodeList& nodeList, const Element& element)
-{
-    return nodeList.elementMatches(element);
-}
+namespace {
+
+class IsMatch {
+public:
+    IsMatch(const LiveNodeList& list)
+        : m_list(list)
+    { }
+
+    bool operator() (const Element& element) const
+    {
+        return m_list.elementMatches(element);
+    }
+
+private:
+    const LiveNodeList& m_list;
+};
+
+} // namespace
 
 Node* LiveNodeList::virtualOwnerNode() const
 {
@@ -52,22 +66,22 @@ Element* LiveNodeList::item(unsigned offset) const
 
 Element* LiveNodeList::traverseToFirstElement() const
 {
-    return firstMatchingElement(*this);
+    return ElementTraversal::firstWithin(rootNode(), IsMatch(*this));
 }
 
 Element* LiveNodeList::traverseToLastElement() const
 {
-    return lastMatchingElement(*this);
+    return ElementTraversal::lastWithin(rootNode(), IsMatch(*this));
 }
 
-Element* LiveNodeList::traverseForwardToOffset(unsigned offset, Element& currentNode, unsigned& currentOffset) const
+Element* LiveNodeList::traverseForwardToOffset(unsigned offset, Element& currentElement, unsigned& currentOffset) const
 {
-    return traverseMatchingElementsForwardToOffset(*this, offset, currentNode, currentOffset);
+    return traverseMatchingElementsForwardToOffset(currentElement, &rootNode(), offset, currentOffset, IsMatch(*this));
 }
 
-Element* LiveNodeList::traverseBackwardToOffset(unsigned offset, Element& currentNode, unsigned& currentOffset) const
+Element* LiveNodeList::traverseBackwardToOffset(unsigned offset, Element& currentElement, unsigned& currentOffset) const
 {
-    return traverseMatchingElementsBackwardToOffset(*this, offset, currentNode, currentOffset);
+    return traverseMatchingElementsBackwardToOffset(currentElement, &rootNode(), offset, currentOffset, IsMatch(*this));
 }
 
 void LiveNodeList::trace(Visitor* visitor)