Rename childNodeCount() / childNode() methods for clarity

Source/core/dom/ContainerNode.h

Index: Source/core/dom/ContainerNode.h
diff --git a/Source/core/dom/ContainerNode.h b/Source/core/dom/ContainerNode.h
index 62a3e3230b2b586de5a51f6d301914886bcef541..67b4c472a61ab46e0ba5174a3a9de3769e4bc8a4 100644
--- a/Source/core/dom/ContainerNode.h
+++ b/Source/core/dom/ContainerNode.h
@@ -82,7 +82,7 @@ public:
 
     Node* firstChild() const { return m_firstChild; }
     Node* lastChild() const { return m_lastChild; }
-    bool hasChildNodes() const { return m_firstChild; }
+    bool hasChildren() const { return m_firstChild; }
 
     bool hasOneChild() const { return m_firstChild && !m_firstChild->nextSibling(); }
     bool hasOneTextChild() const { return hasOneChild() && m_firstChild->isTextNode(); }
@@ -90,8 +90,8 @@ public:
 
     PassRefPtr<HTMLCollection> children();
 
-    unsigned childNodeCount() const;
-    Node* childNode(unsigned index) const;
+    unsigned countChildren() const;
+    Node* traverseToChildAt(unsigned index) const;
 
     PassRefPtr<Element> querySelector(const AtomicString& selectors, ExceptionState&);
     PassRefPtr<NodeList> querySelectorAll(const AtomicString& selectors, ExceptionState&);
@@ -215,18 +215,18 @@ inline void ContainerNode::detachChildren(const AttachContext& context)
         child->detach(childrenContext);
 }
 
-inline unsigned Node::childNodeCount() const
+inline unsigned Node::countChildren() const
 {
     if (!isContainerNode())
         return 0;
-    return toContainerNode(this)->childNodeCount();
+    return toContainerNode(this)->countChildren();
 }
 
-inline Node* Node::childNode(unsigned index) const
+inline Node* Node::traverseToChildAt(unsigned index) const
 {
     if (!isContainerNode())
         return 0;
-    return toContainerNode(this)->childNode(index);
+    return toContainerNode(this)->traverseToChildAt(index);
 }
 
 inline Node* Node::firstChild() const