desktop-views: Create one fewer aura::Window for each widget.

ui/views/widget/desktop_aura/desktop_native_widget_aura.h

Index: ui/views/widget/desktop_aura/desktop_native_widget_aura.h
diff --git a/ui/views/widget/desktop_aura/desktop_native_widget_aura.h b/ui/views/widget/desktop_aura/desktop_native_widget_aura.h
index 3340fb214352bed290c3bed577ebc608ecabb1f2..f8811c88afe0695ccc2d1bbf72b927e0b10dcf14 100644
--- a/ui/views/widget/desktop_aura/desktop_native_widget_aura.h
+++ b/ui/views/widget/desktop_aura/desktop_native_widget_aura.h
@@ -258,11 +258,7 @@ class VIEWS_EXPORT DesktopNativeWidgetAura
 
   std::unique_ptr<DesktopCaptureClient> capture_client_;
 
-  // Child of the root, contains |content_window_|.
-  aura::Window* content_window_container_;
-
-  // Child of |content_window_container_|. This is the return value from
-  // GetNativeView().
+  // This is the return value from GetNativeView().
   // WARNING: this may be NULL, in particular during shutdown it becomes NULL.
   aura::Window* content_window_;