Revert of Move RtcEventLog object from inside VoiceEngine to Call.

webrtc/voice_engine/channel_proxy.cc

Index: webrtc/voice_engine/channel_proxy.cc
diff --git a/webrtc/voice_engine/channel_proxy.cc b/webrtc/voice_engine/channel_proxy.cc
index 215d931f1ad3a04093a4ead22e779ff02237ae11..f60728aadc96b070d65700c6a1c9dee6be476bea 100644
--- a/webrtc/voice_engine/channel_proxy.cc
+++ b/webrtc/voice_engine/channel_proxy.cc
@@ -204,11 +204,6 @@
   RTC_DCHECK_EQ(0, error);
 }
 
-void ChannelProxy::SetRtcEventLog(RtcEventLog* event_log) {
-  RTC_DCHECK(thread_checker_.CalledOnValidThread());
-  channel()->SetRtcEventLog(event_log);
-}
-
 Channel* ChannelProxy::channel() const {
   RTC_DCHECK(channel_owner_.channel());
   return channel_owner_.channel();