  explicit SecurityExploitTestInterstitialPage(WebContents* contents) {
    InterstitialPage* interstitial = InterstitialPage::Create(
        contents, true, contents->GetLastCommittedURL(), this);
    interstitial->Show();
  }

The product contains a concurrent code sequence that requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence operating concurrently.