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

webrtc/video/video_encoder.cc

Index: webrtc/video/video_encoder.cc
diff --git a/webrtc/video/video_encoder.cc b/webrtc/video/video_encoder.cc
index 1534a97fdf486bc1c36b672590c9bf896f40c117..5d4867f8c069a78e50a72789d4e26c5ced9a43ab 100644
--- a/webrtc/video/video_encoder.cc
+++ b/webrtc/video/video_encoder.cc
@@ -186,10 +186,4 @@ bool VideoEncoderSoftwareFallbackWrapper::SupportsNativeHandle() const {
   return encoder_->SupportsNativeHandle();
 }
 
-const char* VideoEncoderSoftwareFallbackWrapper::ImplementationName() const {
-  if (fallback_encoder_)
-    return fallback_implementation_name_.c_str();
-  return encoder_->ImplementationName();
-}
-
 }  // namespace webrtc