Revert of Add a window property to associate RWHVA with its child AX tree ID

ui/views/accessibility/ax_window_obj_wrapper.cc

Index: ui/views/accessibility/ax_window_obj_wrapper.cc
diff --git a/ui/views/accessibility/ax_window_obj_wrapper.cc b/ui/views/accessibility/ax_window_obj_wrapper.cc
index d826df32d6ccf02091bdf156381ac831a6f8373b..c1059476a0ad88a89a17ffe2c6f5810deebb40be 100644
--- a/ui/views/accessibility/ax_window_obj_wrapper.cc
+++ b/ui/views/accessibility/ax_window_obj_wrapper.cc
@@ -8,7 +8,6 @@
 
 #include "base/strings/utf_string_conversions.h"
 #include "ui/accessibility/ax_node_data.h"
-#include "ui/accessibility/platform/aura_window_properties.h"
 #include "ui/aura/window.h"
 #include "ui/views/accessibility/ax_aura_obj_cache.h"
 #include "ui/views/widget/widget.h"
@@ -55,11 +54,6 @@
                                     base::UTF16ToUTF8(window_->GetTitle()));
   out_node_data->state = 0;
   out_node_data->location = gfx::RectF(window_->bounds());
-
-  ui::AXTreeIDRegistry::AXTreeID child_ax_tree_id =
-      window_->GetProperty(ui::kChildAXTreeID);
-  if (child_ax_tree_id != ui::AXTreeIDRegistry::kNoAXTreeID)
-    out_node_data->AddIntAttribute(ui::AX_ATTR_CHILD_TREE_ID, child_ax_tree_id);
 }
 
 int32_t AXWindowObjWrapper::GetID() {