message: Remove dead code from DefaultVideoQualityAnalyzer
  Cr-Commit-Position: refs/heads/master@{#28717}
diff: @@ -225,14 +225,6 @@ class DefaultVideoQualityAnalyzer : public VideoQualityAnalyzerInterface {
  enum State { kNew, kActive, kStopped };
  - // Returns last rendered frame for stream if there is one or nullptr
  - // otherwise.
  - VideoFrame* GetLastRenderedFrame(const std::string& stream_label)
  - RTC_EXCLUSIVE_LOCKS_REQUIRED(lock_);
  - void SetLastRenderedFrame(const std::string& stream_label,
  - const VideoFrame& frame)
  - RTC_EXCLUSIVE_LOCKS_REQUIRED(lock_);
  -
  void AddComparison(absl::optional<VideoFrame> captured,
  absl::optional<VideoFrame> rendered,
  bool dropped,
  