Removes/promotes functions from WmWindowMus to WmWindowAura

ash/mus/bridge/wm_root_window_controller_mus.cc

Index: ash/mus/bridge/wm_root_window_controller_mus.cc
diff --git a/ash/mus/bridge/wm_root_window_controller_mus.cc b/ash/mus/bridge/wm_root_window_controller_mus.cc
index e0497d8c1ac2f62ae98f040e026dea2a7be28bd2..eedb2eb1ef8736f89821f72ed3e05a09514f287c 100644
--- a/ash/mus/bridge/wm_root_window_controller_mus.cc
+++ b/ash/mus/bridge/wm_root_window_controller_mus.cc
@@ -14,7 +14,6 @@
 #include "ui/aura/window.h"
 #include "ui/aura/window_property.h"
 #include "ui/display/display.h"
-#include "ui/views/widget/native_widget_aura.h"
 #include "ui/views/widget/widget.h"
 
 DECLARE_WINDOW_PROPERTY_TYPE(ash::mus::WmRootWindowControllerMus*);
@@ -103,11 +102,6 @@ void WmRootWindowControllerMus::ConfigureWidgetInitParamsForContainer(
       WmWindowMus::Get(root_window_controller_->root())
           ->GetChildByShellWindowId(shell_container_id));
   DCHECK(init_params->parent);
-  views::NativeWidgetAura* native_widget_aura =
-      new views::NativeWidgetAura(widget);
-  init_params->native_widget = native_widget_aura;
-  WmWindowMus::Get(native_widget_aura->GetNativeView())
-      ->set_widget(widget, WmWindowMus::WidgetCreationType::INTERNAL);
 }
 
 WmWindow* WmRootWindowControllerMus::FindEventTarget(