NS_TRY_SAFE_CALL_VOID(PR_UnloadLibrary(mLibrary), nsnull);
NS_TRY_SAFE_CALL_VOID(PR_UnloadLibrary(mLibrary), nsnull, nsnull);
  void HandleEvent() {    if (mLibrary)      NS_TRY_SAFE_CALL_VOID(PR_UnloadLibrary(mLibrary), nsnull);  // put our unload call in a saftey wrapper    else       NS_WARNING("missing library from nsPluginUnloadEvent");  }