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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/menu_bar.h
int GetItemCount() const;
  
  bool GetMenuButtonFromScreenPoint(const gfx::Point& point,
                                    AtomMenuModel** menu_model,
                                    views::MenuButton** button);
 protected:
  
  const char* GetClassName() const override;
  
  void OnMenuButtonClicked(views::MenuButton* source,
                           const gfx::Point& point,
                           const ui::Event* event) override;
  void OnNativeThemeChanged(const ui::NativeTheme* theme) override;
 private:
  void UpdateMenuBarColor();
  SkColor background_color_;
#if defined(USE_X11)
  SkColor enabled_color_;
  SkColor disabled_color_;
  SkColor highlight_color_;
  SkColor hover_color_;
#endif
  NativeWindow* window_;
  AtomMenuModel* menu_model_;
  DISALLOW_COPY_AND_ASSIGN(MenuBar);
};
}  
#endif