Revert of Move RtcEventLog object from inside VoiceEngine to Call.

webrtc/pc/channelmanager.h

Index: webrtc/pc/channelmanager.h
diff --git a/webrtc/pc/channelmanager.h b/webrtc/pc/channelmanager.h
index c6a67dfb0746dbfb931112003f83884031f73add..34188e6e58ddedf36adac6f282efde922ddf1d05 100644
--- a/webrtc/pc/channelmanager.h
+++ b/webrtc/pc/channelmanager.h
@@ -138,6 +138,12 @@
   // Stops recording AEC dump.
   void StopAecDump();
 
+  // Starts RtcEventLog using existing file.
+  bool StartRtcEventLog(rtc::PlatformFile file, int64_t max_size_bytes);
+
+  // Stops logging RtcEventLog.
+  void StopRtcEventLog();
+
  private:
   typedef std::vector<VoiceChannel*> VoiceChannels;
   typedef std::vector<VideoChannel*> VideoChannels;