mash: Move directly linked NewWindowDelegate to mojom::NewWindowClient.

ash/display/display_util.cc

Index: ash/display/display_util.cc
diff --git a/ash/display/display_util.cc b/ash/display/display_util.cc
index d61349bc368f6cbe6cab8fa3d1faf96390874445..5c02fe61bd5d042bea860f1b710ba0b8358ad264 100644
--- a/ash/display/display_util.cc
+++ b/ash/display/display_util.cc
@@ -6,16 +6,14 @@
 
 #include <algorithm>
 
-#include "ash/common/new_window_delegate.h"
 #include "ash/common/system/system_notifier.h"
 #include "ash/common/wm_shell.h"
 #include "ash/display/display_manager.h"
-
 #include "ash/display/extended_mouse_warp_controller.h"
 #include "ash/display/null_mouse_warp_controller.h"
 #include "ash/display/unified_mouse_warp_controller.h"
-
 #include "ash/host/ash_window_tree_host.h"
+#include "ash/public/interfaces/new_window.mojom.h"
 #include "ash/shell.h"
 #include "base/strings/string_number_conversions.h"
 #include "grit/ash_resources.h"
@@ -54,7 +52,7 @@ class DisplayErrorNotificationDelegate
   bool HasClickedListener() override { return true; }
 
   void Click() override {
-    WmShell::Get()->new_window_delegate()->OpenFeedbackPage();
+    WmShell::Get()->new_window_client()->OpenFeedbackPage();
   }
 
  private: