Revert of 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 16da9ef29ed0d6be5a678a7aa7f9c2eb8ff23d41..52983fad2dd8bae45e2de0f287e84d04a285c813 100644
--- a/webrtc/media/engine/webrtcvoiceengine.h
+++ b/webrtc/media/engine/webrtcvoiceengine.h
@@ -108,6 +108,14 @@
 
   // 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