DOMHighResTimeStamp PerformanceNavigationTiming::unloadEventStart() const {
  bool allow_redirect_details = GetAllowRedirectDetails();
  DocumentLoadTiming* timing = GetDocumentLoadTiming();

  if (!allow_redirect_details || !timing ||
      !timing->HasSameOriginAsPreviousDocument())
    return 0;
  return Performance::MonotonicTimeToDOMHighResTimeStamp(
      TimeOrigin(), timing->UnloadEventStart(),
      false /* allow_negative_value */);
}

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