void RenderThreadImpl::OnNetworkTypeChanged(
    net::NetworkChangeNotifier::ConnectionType type) {
  EnsureWebKitInitialized();
  bool online = type != net::NetworkChangeNotifier::CONNECTION_NONE;
  WebNetworkStateNotifier::setOnLine(online);
  FOR_EACH_OBSERVER(
      RenderProcessObserver, observers_, NetworkStateChanged(online));
  WebNetworkStateNotifier::setWebConnectionType(
      NetConnectionTypeToWebConnectionType(type));
}

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.