Cleanup of webrtc::VideoFrame.

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 5082eb77b5c87baeed9843fdc9ab1865dc6eb815..b0f105c76bb5ec2d5f183bc0295d3906b1e7c70d 100644
--- a/webrtc/common_video/incoming_video_stream.cc
+++ b/webrtc/common_video/incoming_video_stream.cc
@@ -90,16 +90,16 @@ int32_t IncomingVideoStream::RenderFrame(const uint32_t stream_id,
   return 0;
 }
 
-int32_t IncomingVideoStream::SetStartImage(const VideoFrame& video_frame) {
+void IncomingVideoStream::SetStartImage(const VideoFrame& video_frame) {
   rtc::CritScope csS(&thread_critsect_);
-  return start_image_.CopyFrame(video_frame);
+  start_image_.CopyFrame(video_frame);
 }
 
-int32_t IncomingVideoStream::SetTimeoutImage(const VideoFrame& video_frame,
-                                             const uint32_t timeout) {
+void IncomingVideoStream::SetTimeoutImage(const VideoFrame& video_frame,
+                                          const uint32_t timeout) {
   rtc::CritScope csS(&thread_critsect_);
   timeout_time_ = timeout;
-  return timeout_image_.CopyFrame(video_frame);
+  timeout_image_.CopyFrame(video_frame);
 }
 
 void IncomingVideoStream::SetRenderCallback(