Revert of Remove ignored return code from modules.

webrtc/modules/video_coding/video_sender.cc

Index: webrtc/modules/video_coding/video_sender.cc
diff --git a/webrtc/modules/video_coding/video_sender.cc b/webrtc/modules/video_coding/video_sender.cc
index d92ad4593d2d217b7e24d04e6631507e993e02fe..f14f8521148248507e3ff8048e8dadc708eb94cf 100644
--- a/webrtc/modules/video_coding/video_sender.cc
+++ b/webrtc/modules/video_coding/video_sender.cc
@@ -53,7 +53,9 @@
 
 VideoSender::~VideoSender() {}
 
-void VideoSender::Process() {
+int32_t VideoSender::Process() {
+  int32_t returnValue = VCM_OK;
+
   if (_sendStatsTimer.TimeUntilProcess() == 0) {
     _sendStatsTimer.Processed();
     CriticalSectionScoped cs(process_crit_sect_.get());
@@ -70,6 +72,8 @@
     // updated even if bandwidth hasn't changed.
     encoder_params_.input_frame_rate = _mediaOpt.InputFrameRate();
   }
+
+  return returnValue;
 }
 
 int64_t VideoSender::TimeUntilNextProcess() {