Move some AX attrs from AXNodeData to AXTreeData.

content/common/ax_content_node_data.cc

Index: content/common/ax_content_node_data.cc
diff --git a/content/common/ax_content_node_data.cc b/content/common/ax_content_node_data.cc
index 677503c2285697231b0ef1c07713ba0adb86c087..0c7359a93cb0bda72cf7bfdccd76dea8a6e536db 100644
--- a/content/common/ax_content_node_data.cc
+++ b/content/common/ax_content_node_data.cc
@@ -69,12 +69,6 @@ std::string AXContentNodeData::ToString() const {
   for (auto iter : content_int_attributes) {
     std::string value = IntToString(iter.second);
     switch (iter.first) {
-      case AX_CONTENT_ATTR_ROUTING_ID:
-        result += " routing_id=" + value;
-        break;
-      case AX_CONTENT_ATTR_PARENT_ROUTING_ID:
-        result += " parent_routing_id=" + value;
-        break;
       case AX_CONTENT_ATTR_CHILD_ROUTING_ID:
         result += " child_routing_id=" + value;
         break;
@@ -90,4 +84,23 @@ std::string AXContentNodeData::ToString() const {
   return result;
 }
 
+AXContentTreeData::AXContentTreeData()
+    : routing_id(-1),
+      parent_routing_id(-1) {
+}
+
+AXContentTreeData::~AXContentTreeData() {
+}
+
+std::string AXContentTreeData::ToString() const {
+  std::string result = AXTreeData::ToString();
+
+  if (routing_id != -1)
+    result += " routing_id=" + IntToString(routing_id);
+  if (parent_routing_id != -1)
+    result += " parent_routing_id=" + IntToString(parent_routing_id);
+
+  return result;
+}
+
 }  // namespace ui