* 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
if (Emit("open-file", file_path)) {
    *prevent_default = true;
  }
}
void App::OnOpenURL(const std::string& url) {
  Emit("open-url", url);
}
void App::OnActivate(bool has_visible_windows) {
  Emit("activate", has_visible_windows);
}
void App::OnWillFinishLaunching() {
  Emit("will-finish-launching");
}
void App::OnFinishLaunching(const base::DictionaryValue& launch_info) {
#if defined(OS_LINUX)
  
  
  media::AudioManager::SetGlobalAppName(Browser::Get()->GetName());
#endif
  Emit("ready", launch_info);
}
void App::OnPreMainMessageLoopRun() {
  content::BrowserChildProcessObserver::Add(this);
  if (process_singleton_) {
    process_singleton_->OnBrowserReady();
  }
}
void App::OnAccessibilitySupportChanged() {