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Minimal test - lines (24, 89)

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namespace mozilla {

class NonBlockingAsyncInputStream final : public nsIAsyncInputStream,
                                          public nsICloneableInputStream,
                                          public nsIIPCSerializableInputStream,
                                          public nsISeekableStream {
 public:
  NS_DECL_THREADSAFE_ISUPPORTS
  NS_DECL_NSIINPUTSTREAM
  NS_DECL_NSIASYNCINPUTSTREAM
  NS_DECL_NSICLONEABLEINPUTSTREAM
  NS_DECL_NSIIPCSERIALIZABLEINPUTSTREAM
  NS_DECL_NSISEEKABLESTREAM
  NS_DECL_NSITELLABLESTREAM

  // |aInputStream| must be a non-blocking, non-async inputSteam.
  static nsresult Create(already_AddRefed aInputStream,
                         nsIAsyncInputStream** aAsyncInputStream);

 private:
  explicit NonBlockingAsyncInputStream(
      already_AddRefed aInputStream);
  ~NonBlockingAsyncInputStream();

  template 
  void SerializeInternal(mozilla::ipc::InputStreamParams& aParams,
                         FileDescriptorArray& aFileDescriptors,
                         bool aDelayedStart, uint32_t aMaxSize,
                         uint32_t* aSizeUsed, M* aManager);

  class AsyncWaitRunnable;

  void RunAsyncWaitCallback(AsyncWaitRunnable* aRunnable,
                            already_AddRefed aCallback);

  nsCOMPtr mInputStream;

  // Raw pointers because these are just QI of mInputStream.
  nsICloneableInputStream* MOZ_NON_OWNING_REF mWeakCloneableInputStream;
  nsIIPCSerializableInputStream* MOZ_NON_OWNING_REF
      mWeakIPCSerializableInputStream;
  nsISeekableStream* MOZ_NON_OWNING_REF mWeakSeekableInputStream;
  nsITellableStream* MOZ_NON_OWNING_REF mWeakTellableInputStream;

  Mutex mLock;

  struct WaitClosureOnly {
    WaitClosureOnly(AsyncWaitRunnable* aRunnable, nsIEventTarget* aEventTarget);

    RefPtr mRunnable;
    nsCOMPtr mEventTarget;
  };

  // This is set when AsyncWait is called with a callback and with
  // WAIT_CLOSURE_ONLY as flag.
  // This is protected by mLock.
  Maybe mWaitClosureOnly;

  // This is protected by mLock.
  RefPtr mAsyncWaitCallback;

  // This is protected by mLock.
  bool mClosed;
};

}  // namespace mozilla