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 3beaf9b2942c784acab4942fa5d7d7cb7e461b38..7be5c6eda4b78a85ef4a6ace4e9205bab40ff02e 100644
--- a/webrtc/voice_engine/channel_proxy.cc
+++ b/webrtc/voice_engine/channel_proxy.cc
@@ -160,6 +160,10 @@ void ChannelProxy::SetSink(std::unique_ptr<AudioSinkInterface> sink) {
   channel()->SetSink(std::move(sink));
 }
 
+void ChannelProxy::SetRtcEventLog(RtcEventLog* event_log) {
+  channel()->SetRtcEventLog(event_log);
+}
+
 Channel* ChannelProxy::channel() const {
   RTC_DCHECK(channel_owner_.channel());
   return channel_owner_.channel();