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Minimal test - lines (24, 53)

Code

class nsObserverService final : public nsIObserverService,
                                public nsIMemoryReporter {
 public:
  NS_DECLARE_STATIC_IID_ACCESSOR(NS_OBSERVERSERVICE_CID)

  nsObserverService();

  NS_DECL_ISUPPORTS
  NS_DECL_NSIOBSERVERSERVICE
  NS_DECL_NSIMEMORYREPORTER

  void Shutdown();

  [[nodiscard]] static nsresult Create(nsISupports* aOuter, const nsIID& aIID,
                                       void** aInstancePtr);

  // Unmark any strongly held observers implemented in JS so the cycle
  // collector will not traverse them.
  NS_IMETHOD UnmarkGrayStrongObservers();

 private:
  ~nsObserverService(void);
  void RegisterReporter();
  nsresult EnsureValidCall() const;
  nsresult FilterHttpOnTopics(const char* aTopic);

  static const size_t kSuspectReferentCount = 100;
  bool mShuttingDown;
  nsTHashtable mObserverTopicTable;
};