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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/ui/views/submenu_button.h
#ifndef ATOM_BROWSER_UI_VIEWS_SUBMENU_BUTTON_H_
#define ATOM_BROWSER_UI_VIEWS_SUBMENU_BUTTON_H_
#include "ui/views/animation/ink_drop_highlight.h"
#include "ui/views/controls/button/menu_button.h"
namespace atom {
class SubmenuButton : public views::MenuButton {
 public:
  SubmenuButton(const base::string16& title,
                views::MenuButtonListener* menu_button_listener,
                const SkColor& background_color);
  virtual ~SubmenuButton();
  void SetAcceleratorVisibility(bool visible);
  void SetUnderlineColor(SkColor color);
  void SetEnabledColor(SkColor color);
  void SetBackgroundColor(SkColor color);
  base::char16 accelerator() const { return accelerator_; }