Revert of Remove ignored return code from modules.

webrtc/modules/remote_bitrate_estimator/test/bwe.cc

 /*
  *  Copyright (c) 2015 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 49 matching lines @@
  public:
   NullBweSender() {}
   virtual ~NullBweSender() {}
 
   int GetFeedbackIntervalMs() const override { return 1000; }
   void GiveFeedback(const FeedbackPacket& feedback) override {}
   void OnPacketsSent(const Packets& packets) override {}
   int64_t TimeUntilNextProcess() override {
     return std::numeric_limits<int64_t>::max();
   }
-  void Process() override {}
+  int Process() override { return 0; }
 
  private:
   RTC_DISALLOW_COPY_AND_ASSIGN(NullBweSender);
 };
 
 int64_t GetAbsSendTimeInMs(uint32_t abs_send_time) {
   const int kInterArrivalShift = 26;
   const int kAbsSendTimeInterArrivalUpshift = 8;
   const double kTimestampToMs =
       1000.0 / static_cast<double>(1 << kInterArrivalShift);
@@ skipping 190 matching lines @@
 
 float LossAccount::LossRatio() {
   if (num_total == 0)
     return 0.0f;
   return static_cast<float>(num_lost) / num_total;
 }
 
 }  // namespace bwe
 }  // namespace testing
 }  // namespace webrtc