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* [x] I have read the [Contributing Guidelines](https://github.com/electron/electron/blob/master/CONTRIBUTING.md) for this project.
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* [X] I have searched the issue tracker for an issue that matches the one I want to file, without success.

### Issue Details

* **Electron Version:**
  * 5.0.0
* **Operating System:**
  * macOS 10.14.4
* **Last Known Working Electron version:**:
  * 4.1.4

### Expected Behavior
Quitting while a debugger is attached to the process results in the application exiting without error.

### Actual Behavior
Qutting while a debugger is still attached results in the application crashing and macOS showing its crash report dialog.

### To Reproduce

1. Run electron with `--inspect=9229` or `--inspect-brk=9229`.
2. Attach with a debugger (such as Visual Studio Code).
3. Quit electron without detaching.

Below is a repo that reproduces the issue:
[Repo that reproduces the issue](https://github.com/kpes/electron5attachquitcrash)

```sh
$ git clone https://github.com/kpes/electron5attachquitcrash.git
$ npm install
```

atom/browser/atom_browser_main_parts.cc
PreMainMessageLoopStartCommon();
}
#endif
void AtomBrowserMainParts::PreMainMessageLoopStartCommon() {
#if defined(OS_MACOSX)
  InitializeMainNib();
#endif
  media::SetLocalizedStringProvider(MediaStringProvider);
}
device::mojom::GeolocationControl*
AtomBrowserMainParts::GetGeolocationControl() {
  if (geolocation_control_)
    return geolocation_control_.get();
  auto request = mojo::MakeRequest(&geolocation_control_);
  if (!content::ServiceManagerConnection::GetForProcess())
    return geolocation_control_.get();
  service_manager::Connector* connector =
      content::ServiceManagerConnection::GetForProcess()->GetConnector();
  connector->BindInterface(device::mojom::kServiceName, std::move(request));
  return geolocation_control_.get();
}
IconManager* AtomBrowserMainParts::GetIconManager() {
  DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
  if (!icon_manager_.get())
    icon_manager_.reset(new IconManager);
  return icon_manager_.get();
}
}