Convert internal representation of Srtp cryptos from string to int.

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 955eb4209883e1c1def8f7b1b752bfc5ee7a73ff..2e3981243e8e064d825a7df7288bfc8361e9879e 100644
--- a/webrtc/p2p/base/transport.h
+++ b/webrtc/p2p/base/transport.h
@@ -123,8 +123,8 @@ typedef std::vector<ConnectionInfo> ConnectionInfos;
 struct TransportChannelStats {
   int component = 0;
   ConnectionInfos connection_infos;
-  std::string srtp_cipher;
-  int ssl_cipher = 0;
+  int srtp_crypto_suite = rtc::SRTP_INVALID_CRYPTO_SUITE;
+  int ssl_cipher_suite = rtc::TLS_NULL_WITH_NULL_NULL;
 };
 
 // Information about all the channels of a transport.