Change WebRTC SslCipher to be exposed as number only.

webrtc/p2p/base/transport.h

Index: webrtc/p2p/base/transport.h
diff --git a/webrtc/p2p/base/transport.h b/webrtc/p2p/base/transport.h
index cd763ab3bcf1404c441e29a6b326c1e5a9c0631d..cfe73cb331300a62ef1fcc1306719ee940410a69 100644
--- a/webrtc/p2p/base/transport.h
+++ b/webrtc/p2p/base/transport.h
@@ -126,7 +126,7 @@ struct TransportChannelStats {
   int component;
   ConnectionInfos connection_infos;
   std::string srtp_cipher;
-  std::string ssl_cipher;
+  rtc::SslCipher ssl_cipher;
 };
 
 // Information about all the channels of a transport.