Revert of Remove ignored return code from modules.

webrtc/modules/remote_bitrate_estimator/remote_bitrate_estimator_single_stream.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 100 matching lines @@
     if (prior_state != kBwOverusing ||
         remote_rate_->TimeToReduceFurther(now_ms, incoming_bitrate_bps)) {
       // The first overuse should immediately trigger a new estimate.
       // We also have to update the estimate immediately if we are overusing
       // and the target bitrate is too high compared to what we are receiving.
       UpdateEstimate(now_ms);
     }
   }
 }
 
-void RemoteBitrateEstimatorSingleStream::Process() {
+int32_t RemoteBitrateEstimatorSingleStream::Process() {
   if (TimeUntilNextProcess() > 0) {
-    return;
+    return 0;
   }
   {
     CriticalSectionScoped cs(crit_sect_.get());
     UpdateEstimate(clock_->TimeInMilliseconds());
   }
   last_process_time_ = clock_->TimeInMilliseconds();
+  return 0;
 }
 
 int64_t RemoteBitrateEstimatorSingleStream::TimeUntilNextProcess() {
   if (last_process_time_ < 0) {
     return 0;
   }
   {
     CriticalSectionScoped cs_(crit_sect_.get());
     return last_process_time_ + process_interval_ms_ -
         clock_->TimeInMilliseconds();
@@ skipping 84 matching lines @@
     (*ssrcs)[i] = it->first;
   }
 }
 
 void RemoteBitrateEstimatorSingleStream::SetMinBitrate(int min_bitrate_bps) {
   CriticalSectionScoped cs(crit_sect_.get());
   remote_rate_->SetMinBitrate(min_bitrate_bps);
 }
 
 }  // namespace webrtc