Remove deprecated VideoEncoder metadata methods

Bug: webrtc:9890
Change-Id: Ie54fdb2727c49abbaab32848c6eeffc9d04a9229
Reviewed-on: https://webrtc-review.googlesource.com/c/111182
Commit-Queue: Erik Språng <sprang@webrtc.org>
Reviewed-by: Niels Moller <nisse@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#25857}
diff --git a/modules/video_coding/include/video_codec_interface.h b/modules/video_coding/include/video_codec_interface.h
index 38583bf..d6e696d 100644
--- a/modules/video_coding/include/video_codec_interface.h
+++ b/modules/video_coding/include/video_codec_interface.h
@@ -75,12 +75,10 @@
 // must be fitted with a copy-constructor. This is because it is copied
 // in the copy-constructor of VCMEncodedFrame.
 struct CodecSpecificInfo {
-  CodecSpecificInfo() : codecType(kVideoCodecGeneric), codec_name(nullptr) {
+  CodecSpecificInfo() : codecType(kVideoCodecGeneric) {
     memset(&codecSpecific, 0, sizeof(codecSpecific));
   }
   VideoCodecType codecType;
-  // |codec_name| is deprecated, use name provided by VideoEncoder instead.
-  const char* codec_name;
   CodecSpecificInfoUnion codecSpecific;
 };