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### Issue Details

* **Electron Version:** 8.0.0-beta.4
* **Operating System:** Linux (tested on: Manjaro LXDE, Ubuntu 19.04/19.10 Gnome Shell)
* **Last Known Working Electron version:** 7.1.3

### Expected Behavior
Tray icon created.

### Actual Behavior
No tray icon created.

### To Reproduce
https://github.com/vladimiry-playground/electron-quick-start-tray-issue

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### Screenshots
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### Additional Information

The issue has been partially fixed within https://github.com/electron/electron/issues/21154

CC @codebytere 

shell/browser/ui/tray_icon_gtk.cc
tool_tip_ = base::UTF8ToUTF16(tool_tip);
  icon_->SetToolTip(tool_tip_);
}
void TrayIconGtk::SetContextMenu(AtomMenuModel* menu_model) {
  menu_model_ = menu_model;
  icon_->UpdatePlatformContextMenu(menu_model_);
}
const gfx::ImageSkia& TrayIconGtk::GetImage() const {
  return image_;
}
const base::string16& TrayIconGtk::GetToolTip() const {
  return tool_tip_;
}
ui::MenuModel* TrayIconGtk::GetMenuModel() const {
  return menu_model_;
}
void TrayIconGtk::OnImplInitializationFailed() {}
void TrayIconGtk::OnClick() {
  NotifyClicked();
}
bool TrayIconGtk::HasClickAction() {
  return false;
}
TrayIcon* TrayIcon::Create() {
  return new TrayIconGtk;
}
}