Revert of Remove ignored return code from modules.

webrtc/modules/congestion_controller/congestion_controller.cc

 /*
  *  Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 35 matching lines @@
 
   void IncomingPacket(int64_t arrival_time_ms,
                       size_t payload_size,
                       const RTPHeader& header,
                       bool was_paced) override {
     CriticalSectionScoped cs(crit_sect_.get());
     PickEstimatorFromHeader(header);
     rbe_->IncomingPacket(arrival_time_ms, payload_size, header, was_paced);
   }
 
-  void Process() override {
+  int32_t Process() override {
     CriticalSectionScoped cs(crit_sect_.get());
-    rbe_->Process();
+    return rbe_->Process();
   }
 
   int64_t TimeUntilNextProcess() override {
     CriticalSectionScoped cs(crit_sect_.get());
     return rbe_->TimeUntilNextProcess();
   }
 
   void OnRttUpdate(int64_t avg_rtt_ms, int64_t max_rtt_ms) override {
     CriticalSectionScoped cs(crit_sect_.get());
     rbe_->OnRttUpdate(avg_rtt_ms, max_rtt_ms);
@@ skipping 165 matching lines @@
 void CongestionController::OnRttUpdate(int64_t avg_rtt_ms, int64_t max_rtt_ms) {
   remote_bitrate_estimator_->OnRttUpdate(avg_rtt_ms, max_rtt_ms);
   transport_feedback_adapter_.OnRttUpdate(avg_rtt_ms, max_rtt_ms);
 }
 
 int64_t CongestionController::TimeUntilNextProcess() {
   return std::min(bitrate_controller_->TimeUntilNextProcess(),
                   remote_bitrate_estimator_->TimeUntilNextProcess());
 }
 
-void CongestionController::Process() {
+int32_t CongestionController::Process() {
   bitrate_controller_->Process();
   remote_bitrate_estimator_->Process();
+  return 0;
 }
 
 }  // namespace webrtc