* **Electron Version** (output of `node_modules/.bin/electron --version`):
  * 4.0.4
* **Operating System** (Platform and Version):
  * macOS 10.14.3
* **Last known working Electron version** (if applicable):
  * unknown

### Expected Behavior
Setting a MenuItem to `visible: false` will hide it from the menu but **not** disable it.

See documentation https://electronjs.org/docs/api/menu-item

### Actual behavior
MenuItem is hidden AND disabled

### To Reproduce
https://github.com/aaronraimist/electron-quick-start/tree/visible-false

There should be one menu item visible (zoomin) and zoom out should also work but it doesn't.
(my issue is with zoomin but since that is kind of broken I did the demo with zoomout)

Menu code looks like
```
const template = [
  {
    label: 'View',
    submenu: [
	  { role: 'zoomin' },
      { role: 'zoomout', visible: false },
    ],
  }
]
```

```sh
# Clone this repository
git clone https://github.com/electron/electron-quick-start
# Go into the repository
cd electron-quick-start
# Checkout branch
git checkout visible-false
# Install dependencies
npm install
# Run the app
npm start
```

### Additional Information

I'm trying to work around https://github.com/electron/electron/issues/15496 by creating two menu items, one visible and one invisible but it doesn't work. See https://github.com/vector-im/riot-web/pull/8381
atom/browser/api/atom_api_menu.cc
v8::Locker locker(isolate());
  v8::HandleScope handle_scope(isolate());
  menu_will_show_.Run(GetWrapper());
}
void Menu::InsertItemAt(int index,
                        int command_id,
                        const base::string16& label) {
  model_->InsertItemAt(index, command_id, label);
}
void Menu::InsertSeparatorAt(int index) {
  model_->InsertSeparatorAt(index, ui::NORMAL_SEPARATOR);
}
void Menu::InsertCheckItemAt(int index,
                             int command_id,
                             const base::string16& label) {
  model_->InsertCheckItemAt(index, command_id, label);
}
void Menu::InsertRadioItemAt(int index,
                             int command_id,
                             const base::string16& label,
                             int group_id) {
  model_->InsertRadioItemAt(index, command_id, label, group_id);
}
void Menu::InsertSubMenuAt(int index,