message: Fix a build warning.
diff: @@ -66,7 +66,7 @@ class SignalEvent {
  /// Wait for the event, with a timeout.
  /// Returns true if we were, in fact, signalled (false if we hit our
  /// timeout)
  - bool wait(int milliseconds) {
  + bool wait(DWORD milliseconds) {
  return WAIT_OBJECT_0 == WaitForSingleObject(h_, milliseconds);
  }
  SignalEvent(SignalEvent const &) = delete;
  