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
confirm_text, GTK_RESPONSE_ACCEPT,
        NULL);
    if (parent_) {
      parent_->SetEnabled(false);
      libgtkui::SetGtkTransientForAura(dialog_, parent_->GetNativeWindow());
      gtk_window_set_modal(GTK_WINDOW(dialog_), TRUE);
    }
    if (action == GTK_FILE_CHOOSER_ACTION_SAVE)
      gtk_file_chooser_set_do_overwrite_confirmation(GTK_FILE_CHOOSER(dialog_),
                                                     TRUE);
    if (action != GTK_FILE_CHOOSER_ACTION_OPEN)
      gtk_file_chooser_set_create_folders(GTK_FILE_CHOOSER(dialog_), TRUE);
    if (!settings.default_path.empty()) {
      if (base::DirectoryExists(settings.default_path)) {
        gtk_file_chooser_set_current_folder(GTK_FILE_CHOOSER(dialog_),
            settings.default_path.value().c_str());
      } else {
        if (settings.default_path.IsAbsolute()) {
          gtk_file_chooser_set_current_folder(
              GTK_FILE_CHOOSER(dialog_),
              settings.default_path.DirName().value().c_str());
        }
        gtk_file_chooser_set_current_name(GTK_FILE_CHOOSER(dialog_),
            settings.default_path.BaseName().value().c_str());
      }
    }
    if (!settings.filters.empty())
      AddFilters(settings.filters);
  }
  ~FileChooserDialog() {