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

content/browser/renderer_host/render_widget_host_view_base.h

Index: content/browser/renderer_host/render_widget_host_view_base.h
diff --git a/content/browser/renderer_host/render_widget_host_view_base.h b/content/browser/renderer_host/render_widget_host_view_base.h
index 40ebb8cb475973d59ab52db5b2de2909a2289907..657ad2027f14a0c5c9deec9f61056a39592cddd5 100644
--- a/content/browser/renderer_host/render_widget_host_view_base.h
+++ b/content/browser/renderer_host/render_widget_host_view_base.h
@@ -31,7 +31,6 @@
 #include "third_party/WebKit/public/web/WebPopupType.h"
 #include "third_party/WebKit/public/web/WebTextDirection.h"
 #include "third_party/skia/include/core/SkImageInfo.h"
-#include "ui/accessibility/ax_tree_id_registry.h"
 #include "ui/base/ime/text_input_mode.h"
 #include "ui/base/ime/text_input_type.h"
 #include "ui/display/display.h"
@@ -211,7 +210,7 @@
   virtual gfx::Point AccessibilityOriginInScreen(const gfx::Rect& bounds);
   virtual gfx::AcceleratedWidget AccessibilityGetAcceleratedWidget();
   virtual gfx::NativeViewAccessible AccessibilityGetNativeViewAccessible();
-  virtual void SetMainFrameAXTreeID(ui::AXTreeIDRegistry::AXTreeID id) {}
+
   // Informs that the focused DOM node has changed.
   virtual void FocusedNodeChanged(bool is_editable_node,
                                   const gfx::Rect& node_bounds_in_screen) {}