* Electron Version: 3.0.0-beta.1 ~ 3.0.0-beta.6
* Operating System (Platform and Version): Ubuntu 16.04.2 LTS
* Last known working Electron version: versions before 3.0.0-beta.1

**Expected Behavior**
Console prints out `time to print stuff` when `Ctrl+P` is pressed.
```
const {Menu, MenuItem} = require('electron')
const menu = new Menu()
  
app.on('ready', () => {
  createWindow()
  menu.append(new MenuItem({
    label: 'Print',
    accelerator: 'CmdOrCtrl+P',
    click: () => { console.log('time to print stuff') }
  }))
  Menu.setApplicationMenu(menu)
})
```
https://github.com/hackjutsu/electron-quick-start/commit/6ceb5d7dcd2d946c071b43a3fdd1b0434ddebff5
**Actual behavior**
No output. The accelerator event is not triggered.

**To Reproduce**
```sh
git clone https://github.com/hackjutsu/electron-quick-start
cd electron-quick-start
npm install
npm run start
```
Try pressing `Ctrl+P`, and observe the output. (nothing happen...)
Change the electron version back to 2.0.0 in `pakcage.json`
```sh
npm install
npm run start
```
Try pressing `Ctrl+P`, and observe the output. (the log `time to print stuff` will show up in console)

atom/browser/ui/views/root_view.h
void SetAutoHideMenuBar(bool auto_hide);
  bool IsMenuBarAutoHide() const;
  void SetMenuBarVisibility(bool visible);
  bool IsMenuBarVisible() const;
  void HandleKeyEvent(const content::NativeWebKeyboardEvent& event);
  void ResetAltState();
  void RestoreFocus();
  
  void Layout() override;
  gfx::Size GetMinimumSize() const override;
  gfx::Size GetMaximumSize() const override;
  bool AcceleratorPressed(const ui::Accelerator& accelerator) override;
 private:
  
  void RegisterAccelerators(AtomMenuModel* menu_model);
  
  NativeWindow* window_;
  
  std::unique_ptr<MenuBar> menu_bar_;
  bool menu_bar_autohide_ = false;
  bool menu_bar_visible_ = false;
  bool menu_bar_alt_pressed_ = false;
  
  accelerator_util::AcceleratorTable accelerator_table_;
  std::unique_ptr<views::ViewTracker> last_focused_view_tracker_;
  DISALLOW_COPY_AND_ASSIGN(RootView);
};
}  
#endif