Add codec name to CodecSpecificInfo and get the codec name stats from there instead.

webrtc/modules/video_coding/generic_encoder.h

Index: webrtc/modules/video_coding/generic_encoder.h
diff --git a/webrtc/modules/video_coding/generic_encoder.h b/webrtc/modules/video_coding/generic_encoder.h
index 9b5d2e62eb29814e555342fe4817491b00b4ab4c..bc1afae55ff89c5c032934ad5b3b45e95e252839 100644
--- a/webrtc/modules/video_coding/generic_encoder.h
+++ b/webrtc/modules/video_coding/generic_encoder.h
@@ -71,8 +71,6 @@ class VCMGenericEncoder {
                  const CodecSpecificInfo* codec_specific,
                  const std::vector<FrameType>& frame_types);
 
-  const char* ImplementationName() const;
-
   void SetEncoderParameters(const EncoderParameters& params);
   EncoderParameters GetEncoderParameters() const;