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 52983fad2dd8bae45e2de0f287e84d04a285c813..16da9ef29ed0d6be5a678a7aa7f9c2eb8ff23d41 100644
--- a/webrtc/media/engine/webrtcvoiceengine.h
+++ b/webrtc/media/engine/webrtcvoiceengine.h
@@ -109,14 +109,6 @@ class WebRtcVoiceEngine final : public webrtc::TraceCallback  {
   // Stops AEC dump.
   void StopAecDump();
 
-  // Starts recording an RtcEventLog using an existing file until the log file
-  // reaches the maximum filesize or the StopRtcEventLog function is called.
-  // If the value of max_size_bytes is <= 0, no limit is used.
-  bool StartRtcEventLog(rtc::PlatformFile file, int64_t max_size_bytes);
-
-  // Stops recording the RtcEventLog.
-  void StopRtcEventLog();
-
  private:
   // Every option that is "set" will be applied. Every option not "set" will be
   // ignored. This allows us to selectively turn on and off different options