During upgrade to the Chromium 61 we have switched from GTK2 to GTK3
and now we have a few warnings about stuff being deprecated in GTK3.
Check any Linux build to get a list of them.

/cc @zcbenz 
atom/browser/ui/file_dialog_gtk.cc
gtk_widget_destroy(dialog_);
    if (parent_)
      parent_->SetEnabled(true);
  }
  void SetupProperties(int properties) {
    if (properties & FILE_DIALOG_MULTI_SELECTIONS)
      gtk_file_chooser_set_select_multiple(GTK_FILE_CHOOSER(dialog()), TRUE);
    if (properties & FILE_DIALOG_SHOW_HIDDEN_FILES)
      g_object_set(dialog(), "show-hidden", TRUE, NULL);
  }
  void RunAsynchronous() {
    g_signal_connect(dialog_, "delete-event",
                     G_CALLBACK(gtk_widget_hide_on_delete), NULL);
    g_signal_connect(dialog_, "response",
                     G_CALLBACK(OnFileDialogResponseThunk), this);
    gtk_widget_show_all(dialog_);
    
    
    int time = ui::X11EventSource::GetInstance()->GetTimestamp();
    gtk_window_present_with_time(GTK_WINDOW(dialog_), time);
  }
  void RunSaveAsynchronous(const SaveDialogCallback& callback) {