Remove ignored return code from modules.

ModuleProcessImpl doesn't act on return codes and having them around is
confusing (it's unclear what an error return code here would do even).

BUG=
R=tommi@webrtc.org

Review URL: https://codereview.webrtc.org/1703833002 .

Cr-Commit-Position: refs/heads/master@{#11747}
diff --git a/webrtc/modules/bitrate_controller/bitrate_controller_impl.cc b/webrtc/modules/bitrate_controller/bitrate_controller_impl.cc
index 72a5ff5..bf60878 100644
--- a/webrtc/modules/bitrate_controller/bitrate_controller_impl.cc
+++ b/webrtc/modules/bitrate_controller/bitrate_controller_impl.cc
@@ -162,16 +162,15 @@
       kBitrateControllerUpdateIntervalMs - time_since_update_ms, 0);
 }
 
-int32_t BitrateControllerImpl::Process() {
+void BitrateControllerImpl::Process() {
   if (TimeUntilNextProcess() > 0)
-    return 0;
+    return;
   {
     rtc::CritScope cs(&critsect_);
     bandwidth_estimation_.UpdateEstimate(clock_->TimeInMilliseconds());
   }
   MaybeTriggerOnNetworkChanged();
   last_bitrate_update_ms_ = clock_->TimeInMilliseconds();
-  return 0;
 }
 
 void BitrateControllerImpl::OnReceivedRtcpReceiverReport(
diff --git a/webrtc/modules/bitrate_controller/bitrate_controller_impl.h b/webrtc/modules/bitrate_controller/bitrate_controller_impl.h
index 74f3c14..da42b4c 100644
--- a/webrtc/modules/bitrate_controller/bitrate_controller_impl.h
+++ b/webrtc/modules/bitrate_controller/bitrate_controller_impl.h
@@ -45,7 +45,7 @@
   void SetEventLog(RtcEventLog* event_log) override;
 
   int64_t TimeUntilNextProcess() override;
-  int32_t Process() override;
+  void Process() override;
 
  private:
   class RtcpBandwidthObserverImpl;
diff --git a/webrtc/modules/bitrate_controller/include/mock/mock_bitrate_controller.h b/webrtc/modules/bitrate_controller/include/mock/mock_bitrate_controller.h
index 8748696..45b596a 100644
--- a/webrtc/modules/bitrate_controller/include/mock/mock_bitrate_controller.h
+++ b/webrtc/modules/bitrate_controller/include/mock/mock_bitrate_controller.h
@@ -36,7 +36,7 @@
   MOCK_CONST_METHOD1(AvailableBandwidth, bool(uint32_t* bandwidth));
   MOCK_METHOD1(SetReservedBitrate, void(uint32_t reserved_bitrate_bps));
 
-  MOCK_METHOD0(Process, int());
+  MOCK_METHOD0(Process, void());
   MOCK_METHOD0(TimeUntilNextProcess, int64_t());
 };
 }  // namespace test