Refactor BrowserAccessibility to prepare for AXNode (re-land)

content/browser/accessibility/accessibility_tree_formatter.cc

Index: content/browser/accessibility/accessibility_tree_formatter.cc
diff --git a/content/browser/accessibility/accessibility_tree_formatter.cc b/content/browser/accessibility/accessibility_tree_formatter.cc
index 999476f6b4b0ee3a0115474db5ff2425deda8344..edd366da4ff9201ea3dc4591dda28929b4d79817 100644
--- a/content/browser/accessibility/accessibility_tree_formatter.cc
+++ b/content/browser/accessibility/accessibility_tree_formatter.cc
@@ -68,7 +68,7 @@ void AccessibilityTreeFormatter::RecursiveBuildAccessibilityTree(
   dict->Set(kChildrenDictAttr, children);
 
   for (size_t i = 0; i < node.PlatformChildCount(); ++i) {
-    BrowserAccessibility* child_node = node.children()[i];
+    BrowserAccessibility* child_node = node.InternalGetChild(i);
     base::DictionaryValue* child_dict = new base::DictionaryValue;
     children->Append(child_dict);
     RecursiveBuildAccessibilityTree(*child_node, child_dict);
@@ -96,7 +96,7 @@ void AccessibilityTreeFormatter::RecursiveFormatAccessibilityTree(
      !defined(TOOLKIT_GTK))
 void AccessibilityTreeFormatter::AddProperties(const BrowserAccessibility& node,
                                                base::DictionaryValue* dict) {
-  dict->SetInteger("id", node.renderer_id());
+  dict->SetInteger("id", node.GetId());
 }
 
 base::string16 AccessibilityTreeFormatter::ToString(