Remove deprected functions from EncodedImageCallback and RtpRtcp

webrtc/modules/video_coding/codecs/i420/i420.cc

Index: webrtc/modules/video_coding/codecs/i420/i420.cc
diff --git a/webrtc/modules/video_coding/codecs/i420/i420.cc b/webrtc/modules/video_coding/codecs/i420/i420.cc
index d0c8d0c62c97113090ee35aea284a6098b4c4f58..ad4a8a1a4002f6c91d2aa2222161cafe6001185d 100644
--- a/webrtc/modules/video_coding/codecs/i420/i420.cc
+++ b/webrtc/modules/video_coding/codecs/i420/i420.cc
@@ -116,7 +116,8 @@ int I420Encoder::Encode(const VideoFrame& inputImage,
     return WEBRTC_VIDEO_CODEC_MEMORY;
   _encodedImage._length = ret_length + kI420HeaderSize;
 
-  _encodedCompleteCallback->Encoded(_encodedImage, NULL, NULL);
+  _encodedCompleteCallback->OnEncodedImage(_encodedImage, nullptr, nullptr);
+
   return WEBRTC_VIDEO_CODEC_OK;
 }