* 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
Emit("accessibility-support-changed", IsAccessibilitySupportEnabled());
}
#if defined(OS_MACOSX)
void App::OnWillContinueUserActivity(bool* prevent_default,
                                     const std::string& type) {
  if (Emit("will-continue-activity", type)) {
    *prevent_default = true;
  }
}
void App::OnDidFailToContinueUserActivity(const std::string& type,
                                          const std::string& error) {
  Emit("continue-activity-error", type, error);
}
void App::OnContinueUserActivity(bool* prevent_default,
                                 const std::string& type,
                                 const base::DictionaryValue& user_info) {
  if (Emit("continue-activity", type, user_info)) {
    *prevent_default = true;
  }
}
void App::OnUserActivityWasContinued(const std::string& type,
                                     const base::DictionaryValue& user_info) {
  Emit("activity-was-continued", type, user_info);
}
void App::OnUpdateUserActivityState(bool* prevent_default,