Remove ignored return code from modules.

webrtc/modules/congestion_controller/include/congestion_controller.h

Index: webrtc/modules/congestion_controller/include/congestion_controller.h
diff --git a/webrtc/modules/congestion_controller/include/congestion_controller.h b/webrtc/modules/congestion_controller/include/congestion_controller.h
index f4381e2a4dd9ae645063b8b1ce87c8c93cc2fc9e..2c0b2e3d79c627a3c36a51819818b21e53ff73df 100644
--- a/webrtc/modules/congestion_controller/include/congestion_controller.h
+++ b/webrtc/modules/congestion_controller/include/congestion_controller.h
@@ -65,7 +65,7 @@ class CongestionController : public CallStatsObserver, public Module {
 
   // Implements Module.
   int64_t TimeUntilNextProcess() override;
-  int32_t Process() override;
+  void Process() override;
 
  private:
   Clock* const clock_;