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
const OpenDialogCallback& callback) {
  GtkFileChooserAction action = GTK_FILE_CHOOSER_ACTION_OPEN;
  if (settings.properties & FILE_DIALOG_OPEN_DIRECTORY)
    action = GTK_FILE_CHOOSER_ACTION_SELECT_FOLDER;
  FileChooserDialog* open_dialog = new FileChooserDialog(action, settings);
  open_dialog->SetupProperties(settings.properties);
  open_dialog->RunOpenAsynchronous(callback);
}
bool ShowSaveDialog(const DialogSettings& settings,
                    base::FilePath* path) {
  FileChooserDialog save_dialog(GTK_FILE_CHOOSER_ACTION_SAVE, settings);
  gtk_widget_show_all(save_dialog.dialog());
  int response = gtk_dialog_run(GTK_DIALOG(save_dialog.dialog()));
  if (response == GTK_RESPONSE_ACCEPT) {
    *path = save_dialog.GetFileName();
    return true;
  } else {
    return false;
  }
}
void ShowSaveDialog(const DialogSettings& settings,
                    const SaveDialogCallback& callback) {
  FileChooserDialog* save_dialog = new FileChooserDialog(
      GTK_FILE_CHOOSER_ACTION_SAVE, settings);
  save_dialog->RunSaveAsynchronous(callback);
}
}