Move RtcEventLog object from inside VoiceEngine to Call.

webrtc/media/engine/webrtcvoiceengine.h

Index: webrtc/media/engine/webrtcvoiceengine.h
diff --git a/webrtc/media/engine/webrtcvoiceengine.h b/webrtc/media/engine/webrtcvoiceengine.h
index a16d0428fe71a80c0484042f8ecb8fd1faebb49a..cc1c6f7fcda76e1a1b4ffdc3dec36846dfd90256 100644
--- a/webrtc/media/engine/webrtcvoiceengine.h
+++ b/webrtc/media/engine/webrtcvoiceengine.h
@@ -87,13 +87,6 @@ class WebRtcVoiceEngine final : public webrtc::TraceCallback  {
   // Stops AEC dump.
   void StopAecDump();
 
-  // Starts recording an RtcEventLog using an existing file until 10 minutes
-  // pass or the StopRtcEventLog function is called.
-  bool StartRtcEventLog(rtc::PlatformFile file);
-
-  // Stops recording the RtcEventLog.
-  void StopRtcEventLog();
-
  private:
   void Construct();
   bool InitInternal();