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Minimal test - lines (255, 302)

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nsXPLookAndFeel* nsXPLookAndFeel::GetInstance() {
  if (sInstance) {
    return sInstance;
  }

  NS_ENSURE_TRUE(!sShutdown, nullptr);

  // If we're in a content process, then the parent process will have supplied
  // us with an initial FullLookAndFeel object (for when the RemoteLookAndFeel
  // is to be used) or an initial LookAndFeelCache object (for regular
  // LookAndFeel implementations).  We grab this data from the ContentChild,
  // where it's been temporarily stashed, and initialize our new LookAndFeel
  // object with it.

  LookAndFeelCache* lnfCache = nullptr;
  FullLookAndFeel* fullLnf = nullptr;
  widget::LookAndFeelData* lnfData = nullptr;

  if (auto* cc = mozilla::dom::ContentChild::GetSingleton()) {
    lnfData = &cc->BorrowLookAndFeelData();
    switch (lnfData->type()) {
      case widget::LookAndFeelData::TLookAndFeelCache:
        lnfCache = &lnfData->get_LookAndFeelCache();
        break;
      case widget::LookAndFeelData::TFullLookAndFeel:
        fullLnf = &lnfData->get_FullLookAndFeel();
        break;
      default:
        MOZ_ASSERT_UNREACHABLE("unexpected LookAndFeelData type");
    }
  }

  if (fullLnf) {
    sInstance = new widget::RemoteLookAndFeel(std::move(*fullLnf));
  } else if (gfxPlatform::IsHeadless()) {
    sInstance = new widget::HeadlessLookAndFeel(lnfCache);
  } else {
    sInstance = new nsLookAndFeel(lnfCache);
  }

  // This is only ever used once during initialization, and can be cleared now.
  if (lnfData) {
    *lnfData = widget::LookAndFeelData{};
  }

  nsNativeBasicTheme::Init();
  return sInstance;
}