Remove dead code in IncomingVideoStream that's just causing contention.

webrtc/common_video/incoming_video_stream.cc

Index: webrtc/common_video/incoming_video_stream.cc
diff --git a/webrtc/common_video/incoming_video_stream.cc b/webrtc/common_video/incoming_video_stream.cc
index dce1a7fca4838fedf590b49f47e0166ee1ff9ea8..a5e7ba755d35023ad9ba063d37b0e6b928305077 100644
--- a/webrtc/common_video/incoming_video_stream.cc
+++ b/webrtc/common_video/incoming_video_stream.cc
@@ -26,10 +26,7 @@ IncomingVideoStream::IncomingVideoStream(bool disable_prerenderer_smoothing)
       deliver_buffer_event_(EventTimerWrapper::Create()),
       running_(false),
       external_callback_(nullptr),
-      render_buffers_(new VideoRenderFrames()),
-      incoming_rate_(0),
-      last_rate_calculation_time_ms_(0),
-      num_frames_since_last_calculation_(0) {}
+      render_buffers_(new VideoRenderFrames()) {}
 
 IncomingVideoStream::~IncomingVideoStream() {
   Stop();
@@ -42,17 +39,6 @@ void IncomingVideoStream::OnFrame(const VideoFrame& video_frame) {
     return;
   }
 
-  // Rate statistics.
-  num_frames_since_last_calculation_++;
-  int64_t now_ms = rtc::TimeMillis();
-  if (now_ms >= last_rate_calculation_time_ms_ + kFrameRatePeriodMs) {
-    incoming_rate_ =
-        static_cast<uint32_t>(1000 * num_frames_since_last_calculation_ /
-                              (now_ms - last_rate_calculation_time_ms_));
-    num_frames_since_last_calculation_ = 0;
-    last_rate_calculation_time_ms_ = now_ms;
-  }
-
   // Hand over or insert frame.
   if (disable_prerenderer_smoothing_) {
     DeliverFrame(video_frame);
@@ -133,17 +119,6 @@ int32_t IncomingVideoStream::Stop() {
   return 0;
 }
 
-int32_t IncomingVideoStream::Reset() {
-  rtc::CritScope cs_buffer(&buffer_critsect_);
-  render_buffers_->ReleaseAllFrames();
-  return 0;
-}
-
-uint32_t IncomingVideoStream::IncomingRate() const {
-  rtc::CritScope cs(&stream_critsect_);
-  return incoming_rate_;
-}
-
 bool IncomingVideoStream::IncomingVideoStreamThreadFun(void* obj) {
   return static_cast<IncomingVideoStream*>(obj)->IncomingVideoStreamProcess();
 }