Make event-targeting asynchronous in window server.

services/ui/ws/window_server.cc

Index: services/ui/ws/window_server.cc
diff --git a/services/ui/ws/window_server.cc b/services/ui/ws/window_server.cc
index 812240dfd1267bead665f2862d3d10c3597d7445..518b77899f0cce1f4118954fd0bd7fd12eecc0d5 100644
--- a/services/ui/ws/window_server.cc
+++ b/services/ui/ws/window_server.cc
@@ -611,8 +611,6 @@ void WindowServer::UpdateNativeCursorFromMouseLocation(ServerWindow* window) {
     EventDispatcher* event_dispatcher =
         display_root->window_manager_state()->event_dispatcher();
     event_dispatcher->UpdateCursorProviderByLastKnownLocation();
-    display_root->window_manager_state()->cursor_state().SetCurrentWindowCursor(
-        event_dispatcher->GetCurrentMouseCursor());
   }
 }
 
@@ -628,8 +626,6 @@ void WindowServer::UpdateNativeCursorIfOver(ServerWindow* window) {
     return;
 
   event_dispatcher->UpdateNonClientAreaForCurrentWindow();
-  display_root->window_manager_state()->cursor_state().SetCurrentWindowCursor(
-      event_dispatcher->GetCurrentMouseCursor());
 }
 
 bool WindowServer::IsUserInHighContrastMode(const UserId& user) const {