* 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
std::unique_ptr<base::DictionaryValue> options,
    const net::CompletionCallback& callback,
    std::unique_ptr<CertificateManagerModel> model) {
  certificate_manager_model_ = std::move(model);
  int rv =
      ImportIntoCertStore(certificate_manager_model_.get(), *(options.get()));
  callback.Run(rv);
}
#endif
#if defined(OS_WIN)
v8::Local<v8::Value> App::GetJumpListSettings() {
  JumpList jump_list(Browser::Get()->GetAppUserModelID());
  int min_items = 10;
  std::vector<JumpListItem> removed_items;
  if (jump_list.Begin(&min_items, &removed_items)) {
    
    jump_list.Abort();
  } else {
    LOG(ERROR) << "Failed to begin Jump List transaction.";
  }
  auto dict = mate::Dictionary::CreateEmpty(isolate());
  dict.Set("minItems", min_items);
  dict.Set("removedItems", mate::ConvertToV8(isolate(), removed_items));
  return dict.GetHandle();
}
JumpListResult App::SetJumpList(v8::Local<v8::Value> val,