message: Make VideoFrameTrackingIdInjector implement EncodedImageDataPropagator
  Cr-Commit-Position: refs/heads/master@{#34595}
diff: @@ -27,8 +27,7 @@ namespace webrtc_pc_e2e {
  // (http://www.webrtc.org/experiments/rtp-hdrext/video-frame-tracking-id).
  //
  // Note that this injector doesn't allow to discard frames.
  -class VideoFrameTrackingIdInjector : public EncodedImageDataInjector,
  - public EncodedImageDataExtractor {
  +class VideoFrameTrackingIdInjector : public EncodedImageDataPropagator {
  public:
  EncodedImage InjectData(uint16_t id,
  bool unused_discard,
  