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* Electron version: 2.0.0-beta.3
* Operating system: Ubuntu 16.04.04 LTS

### Expected behavior

App menu should be visible

### Actual behavior

App menu is invisible

### How to reproduce

- Run `electron`
- Observe that the app menu is invisible. It is still possible to open submenus.

![screenshot from 2018-03-14 17-01-18](https://user-images.githubusercontent.com/19880051/37415303-7296c25e-27ab-11e8-8284-d213c8bf5230.png)

atom/browser/native_window_views.cc
XEvent event = {};
  event.xclient.type = ClientMessage;
  event.xclient.send_event = True;
  event.xclient.message_type = XInternAtom(display, msg, False);
  event.xclient.window = window;
  event.xclient.format = 32;
  XSendEvent(display, DefaultRootWindow(display), False,
             SubstructureRedirectMask | SubstructureNotifyMask, &event);
  XFlush(display);
  return True;
}
#endif
class NativeWindowClientView : public views::ClientView {
 public:
  NativeWindowClientView(views::Widget* widget,
                         NativeWindowViews* contents_view)
      : views::ClientView(widget, contents_view) {
  }
  virtual ~NativeWindowClientView() {}
  bool CanClose() override {
    static_cast<NativeWindowViews*>(contents_view())->
        NotifyWindowCloseButtonClicked();
    return false;
  }
 private:
  DISALLOW_COPY_AND_ASSIGN(NativeWindowClientView);
};
}  
NativeWindowViews::NativeWindowViews(