message: Remove unnecessary virtual function specifiers
  This class is never overridden.
  Cr-Commit-Position: refs/heads/main@{#37781}
diff: @@ -28,7 +28,7 @@ class Clock;
  class JitterEstimator {
  public:
  explicit JitterEstimator(Clock* clock, const FieldTrialsView& field_trials);
  - virtual ~JitterEstimator();
  + ~JitterEstimator();
  JitterEstimator(const JitterEstimator&) = delete;
  JitterEstimator& operator=(const JitterEstimator&) = delete;
  @@ -49,8 +49,7 @@ class JitterEstimator {
  // - rtt_mult_add_cap : Multiplier cap from the RTTMultExperiment.
  //
  // Return value : Jitter estimate.
  - virtual TimeDelta GetJitterEstimate(
  - double rtt_multiplier,
  + TimeDelta GetJitterEstimate(double rtt_multiplier,
  absl::optional<TimeDelta> rtt_mult_add_cap);
  // Updates the nack counter.
  