Revert of Move RtcEventLog object from inside VoiceEngine to Call.

webrtc/modules/bitrate_controller/bitrate_controller_impl.h

Index: webrtc/modules/bitrate_controller/bitrate_controller_impl.h
diff --git a/webrtc/modules/bitrate_controller/bitrate_controller_impl.h b/webrtc/modules/bitrate_controller/bitrate_controller_impl.h
index 114e1a678981d8bb640027d6ec57d76d3491a1c1..91f0902cb2fc5ede14a7f0a743e855efe8bc95dc 100644
--- a/webrtc/modules/bitrate_controller/bitrate_controller_impl.h
+++ b/webrtc/modules/bitrate_controller/bitrate_controller_impl.h
@@ -30,9 +30,7 @@
  public:
   // TODO(perkj): BitrateObserver has been deprecated and is not used in WebRTC.
   // |observer| is left for project that is not yet updated.
-  BitrateControllerImpl(Clock* clock,
-                        BitrateObserver* observer,
-                        RtcEventLog* event_log);
+  BitrateControllerImpl(Clock* clock, BitrateObserver* observer);
   virtual ~BitrateControllerImpl() {}
 
   bool AvailableBandwidth(uint32_t* bandwidth) const override;
@@ -55,6 +53,8 @@
   void UpdateDelayBasedEstimate(uint32_t bitrate_bps) override;
 
   void SetReservedBitrate(uint32_t reserved_bitrate_bps) override;
+
+  void SetEventLog(RtcEventLog* event_log) override;
 
   // Returns true if the parameters have changed since the last call.
   bool GetNetworkParameters(uint32_t* bitrate,
@@ -86,7 +86,6 @@
   Clock* const clock_;
   BitrateObserver* const observer_;
   int64_t last_bitrate_update_ms_;
-  RtcEventLog* const event_log_;
 
   rtc::CriticalSection critsect_;
   SendSideBandwidthEstimation bandwidth_estimation_ GUARDED_BY(critsect_);