Move sent key frame stats to send_statistics_proxy class.

webrtc/modules/video_coding/main/source/video_sender.cc

Index: webrtc/modules/video_coding/main/source/video_sender.cc
diff --git a/webrtc/modules/video_coding/main/source/video_sender.cc b/webrtc/modules/video_coding/main/source/video_sender.cc
index c59d05afcd84501c5bed9523a95fa7394c593df7..c5317ec412bb61f4455ec656a2435e85160df1aa 100644
--- a/webrtc/modules/video_coding/main/source/video_sender.cc
+++ b/webrtc/modules/video_coding/main/source/video_sender.cc
@@ -184,13 +184,6 @@ int32_t VideoSender::CodecConfigParameters(uint8_t* buffer,
   return VCM_UNINITIALIZED;
 }
 
-// TODO(andresp): Make const once media_opt is thread-safe and this has a
-// pointer to it.
-int32_t VideoSender::SentFrameCount(VCMFrameCount* frameCount) {
-  *frameCount = _mediaOpt.SentFrameCount();
-  return VCM_OK;
-}
-
 // Get encode bitrate
 int VideoSender::Bitrate(unsigned int* bitrate) const {
   RTC_DCHECK(main_thread_.CalledOnValidThread());