Revert of Remove ignored return code from modules.

webrtc/video/overuse_frame_detector.cc

Index: webrtc/video/overuse_frame_detector.cc
diff --git a/webrtc/video/overuse_frame_detector.cc b/webrtc/video/overuse_frame_detector.cc
index 18c6b9e7edb451e19d672e7ce50eca47461b29ea..9f12137940ab297eeddbe39db73daf424eef3074 100644
--- a/webrtc/video/overuse_frame_detector.cc
+++ b/webrtc/video/overuse_frame_detector.cc
@@ -297,14 +297,14 @@
   }
 }
 
-void OveruseFrameDetector::Process() {
+int32_t OveruseFrameDetector::Process() {
   RTC_DCHECK(processing_thread_.CalledOnValidThread());
 
   int64_t now = clock_->TimeInMilliseconds();
 
   // Used to protect against Process() being called too often.
   if (now < next_process_time_ms_)
-    return;
+    return 0;
 
   next_process_time_ms_ = now + kProcessIntervalMs;
 
@@ -313,7 +313,7 @@
     rtc::CritScope cs(&crit_);
     ++num_process_times_;
     if (num_process_times_ <= options_.min_process_count || !metrics_)
-      return;
+      return 0;
 
     current_metrics = *metrics_;
   }
@@ -358,6 +358,8 @@
                   << " encode usage " << current_metrics.encode_usage_percent
                   << " overuse detections " << num_overuse_detections_
                   << " rampup delay " << rampup_delay;
+
+  return 0;
 }
 
 bool OveruseFrameDetector::IsOverusing(const CpuOveruseMetrics& metrics) {