* Output of `node_modules/.bin/electron --version`: v4.0.0
* Operating System (Platform and Version): macOS 10.14.2

* Output of `node_modules/.bin/electron --version` on last known working Electron version (if applicable): 2.0.7

### Expected behavior

I should be able to call `app.setAccessibilitySupportEnabled(true)` during initialization, and the application should start and stay open.

### Actual behavior

The application starts and exits immediately if `app.setAccessibilitySupportEnabled(true)` is called during initialization. Same for passing in `false`.

### How to reproduce

Here is a simple project that shows this error. The application behaves as expected (does not exit immediately) when this line is commented out:
https://github.com/marisademeglio/electron4-setA11yTreeEnabled/blob/master/src/main/main.js#L27

  $ git clone https://github.com/marisademeglio/electron4-setA11yTreeEnabled.git
  $ yarn install
  $ yarn start

atom/browser/api/atom_api_app.cc
auto* ax_state = content::BrowserAccessibilityState::GetInstance();
  if (enabled) {
    ax_state->OnScreenReaderDetected();
  } else {
    ax_state->DisableAccessibility();
  }
  Browser::Get()->OnAccessibilitySupportChanged();
}
Browser::LoginItemSettings App::GetLoginItemSettings(mate::Arguments* args) {
  Browser::LoginItemSettings options;
  args->GetNext(&options);
  return Browser::Get()->GetLoginItemSettings(options);
}
#if defined(USE_NSS_CERTS)
void App::ImportCertificate(const base::DictionaryValue& options,
                            const net::CompletionCallback& callback) {
  auto browser_context = AtomBrowserContext::From("", false);
  if (!certificate_manager_model_) {
    auto copy = base::DictionaryValue::From(
        base::Value::ToUniquePtrValue(options.Clone()));
    CertificateManagerModel::Create(
        browser_context.get(),
        base::Bind(&App::OnCertificateManagerModelCreated,
                   base::Unretained(this), base::Passed(&copy), callback));
    return;
  }
  int rv = ImportIntoCertStore(certificate_manager_model_.get(), options);
  callback.Run(rv);
}
void App::OnCertificateManagerModelCreated(