void ResourceDispatcherHostImpl::OnRenderViewHostDeleted(
    int child_id,
    int route_id) {
  scheduler_->OnClientDeleted(child_id, route_id);
  CancelRequestsForRoute(child_id, route_id);
}

The product contains a concurrent code sequence that requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence operating concurrently.