Reland Convert internal representation of Srtp cryptos from string to int

webrtc/p2p/base/p2ptransportchannel.h

Index: webrtc/p2p/base/p2ptransportchannel.h
diff --git a/webrtc/p2p/base/p2ptransportchannel.h b/webrtc/p2p/base/p2ptransportchannel.h
index 9f2f3a0bb3bf15525974a37e0b7d122b7702c312..7d9b6121a2a9556b58d1ed8a22eef3e7f89cb15a 100644
--- a/webrtc/p2p/base/p2ptransportchannel.h
+++ b/webrtc/p2p/base/p2ptransportchannel.h
@@ -108,12 +108,12 @@ class P2PTransportChannel : public TransportChannelImpl,
   bool SetSslRole(rtc::SSLRole role) override { return false; }
 
   // Set up the ciphers to use for DTLS-SRTP.
-  bool SetSrtpCiphers(const std::vector<std::string>& ciphers) override {
+  bool SetSrtpCryptoSuites(const std::vector<int>& ciphers) override {
     return false;
   }
 
   // Find out which DTLS-SRTP cipher was negotiated.
-  bool GetSrtpCryptoSuite(std::string* cipher) override { return false; }
+  bool GetSrtpCryptoSuite(int* cipher) override { return false; }
 
   // Find out which DTLS cipher was negotiated.
   bool GetSslCipherSuite(int* cipher) override { return false; }