diff --git a/modules/video_coding/include/video_codec_interface.h b/modules/video_coding/include/video_codec_interface.h
index 94d4271694..d2badf9201 100644
--- a/modules/video_coding/include/video_codec_interface.h
+++ b/modules/video_coding/include/video_codec_interface.h
@@ -28,9 +28,6 @@ class RTPFragmentationHeader;  // forward declaration
 // with a copy-constructor. See below.
 struct CodecSpecificInfoVP8 {
   bool nonReference;
-  // TODO(bugs.webrtc.org/9378): Delete simulcastIdx, replaced by spatial index
-  // member in EncodedImage. Unused, but assigned in downstream code.
-  uint8_t simulcastIdx;
   uint8_t temporalIdx;
   bool layerSync;
   int8_t keyIdx;  // Negative value to skip keyIdx.
@@ -45,9 +42,6 @@ struct CodecSpecificInfoVP9 {
   bool non_ref_for_inter_layer_pred;
 
   uint8_t temporal_idx;
-  // TODO(bugs.webrtc.org/9378): Delete spatial_idx, replaced by spatial index
-  // member in EncodedImage. Unused, but assigned in downstream code.
-  uint8_t spatial_idx;
   bool temporal_up_switch;
   bool inter_layer_predicted;  // Frame is dependent on directly lower spatial
                                // layer frame.
@@ -67,18 +61,11 @@ struct CodecSpecificInfoVP9 {
   bool end_of_picture;
 };
 
-// TODO(bugs.webrtc.org/9378): Delete this struct. Unused, except that
-// simulcast_idx is assigned in downstream code.
-struct CodecSpecificInfoGeneric {
-  uint8_t simulcast_idx;
-};
-
 struct CodecSpecificInfoH264 {
   H264PacketizationMode packetization_mode;
 };
 
 union CodecSpecificInfoUnion {
-  CodecSpecificInfoGeneric generic;
   CodecSpecificInfoVP8 VP8;
   CodecSpecificInfoVP9 VP9;
   CodecSpecificInfoH264 H264;