Revert of Move RtcEventLog object from inside VoiceEngine to Call.

webrtc/voice_engine/voe_codec_impl.h

 /*
  *  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 40 matching lines @@
 
   int GetVADStatus(int channel,
                    bool& enabled,
                    VadModes& mode,
                    bool& disabledDTX) override;
 
   int SetOpusMaxPlaybackRate(int channel, int frequency_hz) override;
 
   int SetOpusDtx(int channel, bool enable_dtx) override;
 
+  RtcEventLog* GetEventLog() override;
+
  protected:
   VoECodecImpl(voe::SharedData* shared);
   ~VoECodecImpl() override;
 
  private:
   voe::SharedData* _shared;
 };
 
 }  // namespace webrtc
 
 #endif  // WEBRTC_VOICE_ENGINE_VOE_CODEC_IMPL_H