message: [VP9 SVC] Cleanup external reference control workaround
  Cr-Commit-Position: refs/heads/master@{#31485}
diff: @@ -587,13 +587,6 @@ int VP9EncoderImpl::InitEncode(const VideoCodec* inst,
  (num_spatial_layers_ > 1 &&
  codec_.mode == VideoCodecMode::kScreensharing) ||
  inter_layer_pred_ == InterLayerPredMode::kOn;
  - // TODO(ilnik): Remove this workaround once external reference control works
  - // nicely with simulcast SVC mode.
  - // Simlucast SVC mode is currently only used in some tests and is impossible
  - // to trigger for users without using some field trials.
  - if (inter_layer_pred_ == InterLayerPredMode::kOff) {
  - external_ref_control_ = false;
  - }
  if (num_temporal_layers_ == 1) {
  gof_.SetGofInfoVP9(kTemporalStructureMode1);
  