* 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 defined(OS_LINUX)
  std::unique_ptr<base::Environment> env(base::Environment::Create());
  env->SetVar("CHROME_DESKTOP", desktop_name);
#endif
}
std::string App::GetLocale() {
  return g_browser_process->GetApplicationLocale();
}
std::string App::GetLocaleCountryCode() {
  std::string region;
#if defined(OS_WIN)
  WCHAR locale_name[LOCALE_NAME_MAX_LENGTH] = {0};
  if (GetLocaleInfoEx(LOCALE_NAME_USER_DEFAULT, LOCALE_SISO3166CTRYNAME,
                      (LPWSTR)&locale_name,
                      sizeof(locale_name) / sizeof(WCHAR)) ||
      GetLocaleInfoEx(LOCALE_NAME_SYSTEM_DEFAULT, LOCALE_SISO3166CTRYNAME,
                      (LPWSTR)&locale_name,
                      sizeof(locale_name) / sizeof(WCHAR))) {
    base::WideToUTF8(locale_name, wcslen(locale_name), &region);
  }
#elif defined(OS_MACOSX)
  CFLocaleRef locale = CFLocaleCopyCurrent();
  CFStringRef value = CFStringRef(
      static_cast<CFTypeRef>(CFLocaleGetValue(locale, kCFLocaleCountryCode)));
  const CFIndex kCStringSize = 128;