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Minimal test - lines (12, 37)

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namespace mozilla {

/**
 * Watches for changes to "logging.*" prefs and then updates the appropriate
 * LogModule's log level. Both the integer and string versions of the LogLevel
 * enum are supported.
 *
 * For example setting the pref "logging.Foo" to "Verbose" will set the
 * LogModule for "Foo" to the LogLevel::Verbose level. Setting "logging.Bar" to
 * 4 would set the LogModule for "Bar" to the LogLevel::Debug level.
 */
class LogModulePrefWatcher : public nsIObserver {
 public:
  NS_DECL_ISUPPORTS
  NS_DECL_NSIOBSERVER

  /**
   * Starts observing logging pref changes.
   */
  static void RegisterPrefWatcher();

 private:
  LogModulePrefWatcher();
  virtual ~LogModulePrefWatcher() = default;
};
}  // namespace mozilla