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/message_box_gtk.cc
if (parent_) {
      parent_->AddObserver(this);
      static_cast<NativeWindowViews*>(parent_)->SetEnabled(false);
      libgtkui::SetGtkTransientForAura(dialog_, parent_->GetNativeWindow());
      gtk_window_set_modal(GTK_WINDOW(dialog_), TRUE);
    }
  }
  ~GtkMessageBox() {
    gtk_widget_destroy(dialog_);
    if (parent_) {
      parent_->RemoveObserver(this);
      static_cast<NativeWindowViews*>(parent_)->SetEnabled(true);
    }
  }
  GtkMessageType GetMessageType(MessageBoxType type) {
    switch (type) {
      case MESSAGE_BOX_TYPE_INFORMATION:
        return GTK_MESSAGE_INFO;
      case MESSAGE_BOX_TYPE_WARNING:
        return GTK_MESSAGE_WARNING;
      case MESSAGE_BOX_TYPE_QUESTION:
        return GTK_MESSAGE_QUESTION;
      case MESSAGE_BOX_TYPE_ERROR:
        return GTK_MESSAGE_ERROR;
      default:
        return GTK_MESSAGE_OTHER;
    }
  }
  const char* TranslateToStock(int id, const std::string& text) {