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Minimal test - lines (71, 90)

Code

already_AddRefed
nsContentTreeOwner::GetWebBrowserChrome() {
  if (!mAppWindow) {
    return nullptr;
  }

  nsCOMPtr docShell;
  mAppWindow->GetDocShell(getter_AddRefs(docShell));

  if (!docShell) {
    return nullptr;
  }

  if (nsCOMPtr chrome =
          do_QueryActor("WebBrowserChrome", docShell->GetDocument())) {
    return chrome.forget();
  }

  return nullptr;
}

Minimal test - lines (51, 69)

Code

class nsSiteWindow : public nsIEmbeddingSiteWindow {
  // nsSiteWindow shares a lifetime with nsContentTreeOwner, and proxies it's
  // AddRef and Release calls to said object.
  // When nsContentTreeOwner is destroyed, nsSiteWindow will be destroyed as
  // well. nsContentTreeOwner is a friend class of nsSiteWindow such that it can
  // call nsSiteWindow's destructor, which is private, as public destructors on
  // reference counted classes are generally unsafe.
  friend class nsContentTreeOwner;

 public:
  explicit nsSiteWindow(nsContentTreeOwner* aAggregator);

  NS_DECL_ISUPPORTS_INHERITED
  NS_DECL_NSIEMBEDDINGSITEWINDOW

 private:
  virtual ~nsSiteWindow();
  nsContentTreeOwner* mAggregator;
};