Revert of Move RtcEventLog object from inside VoiceEngine to Call.

webrtc/voice_engine/include/voe_codec.h

Index: webrtc/voice_engine/include/voe_codec.h
diff --git a/webrtc/voice_engine/include/voe_codec.h b/webrtc/voice_engine/include/voe_codec.h
index 5d94ac27365a91fa3df47901f28ad66422ab7b4f..6c4fb38a2faf4fa18093ba0bbca2cd85853d3c63 100644
--- a/webrtc/voice_engine/include/voe_codec.h
+++ b/webrtc/voice_engine/include/voe_codec.h
@@ -35,6 +35,7 @@
 
 namespace webrtc {
 
+class RtcEventLog;
 class VoiceEngine;
 
 class WEBRTC_DLLEXPORT VoECodec {
@@ -131,6 +132,10 @@
   // success, and -1 if failed.
   virtual int SetOpusDtx(int channel, bool enable_dtx) = 0;
 
+  // Get a pointer to the event logging object associated with this Voice
+  // Engine. This pointer will remain valid until VoiceEngine is destroyed.
+  virtual RtcEventLog* GetEventLog() = 0;
+
  protected:
   VoECodec() {}
   virtual ~VoECodec() {}