mus ws: Consistently use mojom::Cursor instead of int32_t.

services/ui/ws/server_window_observer.h

Index: services/ui/ws/server_window_observer.h
diff --git a/services/ui/ws/server_window_observer.h b/services/ui/ws/server_window_observer.h
index 7ffae1f1c82540121402a20f951d9348168f1b56..f57f0df24dfaf150c11ba06078d44945bf937a08 100644
--- a/services/ui/ws/server_window_observer.h
+++ b/services/ui/ws/server_window_observer.h
@@ -10,6 +10,7 @@
 #include <string>
 #include <vector>
 
+#include "services/ui/public/interfaces/cursor.mojom.h"
 #include "services/ui/public/interfaces/mus_constants.mojom.h"
 
 namespace gfx {
@@ -66,9 +67,9 @@ class ServerWindowObserver {
                                       float new_opacity) {}
 
   virtual void OnWindowPredefinedCursorChanged(ServerWindow* window,
-                                               int32_t cursor_id) {}
+                                               mojom::Cursor cursor_id) {}
   virtual void OnWindowNonClientCursorChanged(ServerWindow* window,
-                                              int32_t cursor_id) {}
+                                              mojom::Cursor cursor_id) {}
 
   virtual void OnWindowTextInputStateChanged(ServerWindow* window,
                                              const ui::TextInputState& state) {}