Deprecate VideoDecoder::Reset() and remove calls.

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 7f06b4cf7d4bd5cfa356abe30390c52bab9e58e5..93204dde9ce72f1e04032757def1dae5f902d8a8 100644
--- a/webrtc/modules/video_coding/codecs/i420/i420.cc
+++ b/webrtc/modules/video_coding/codecs/i420/i420.cc
@@ -147,10 +147,6 @@ I420Decoder::~I420Decoder() {
   Release();
 }
 
-int I420Decoder::Reset() {
-  return WEBRTC_VIDEO_CODEC_OK;
-}
-
 int I420Decoder::InitDecode(const VideoCodec* codecSettings,
                             int /*numberOfCores */) {
   if (codecSettings == NULL) {