Revert of Convert internal representation of Srtp cryptos from string to int.

webrtc/p2p/base/transportchannel.h

Index: webrtc/p2p/base/transportchannel.h
diff --git a/webrtc/p2p/base/transportchannel.h b/webrtc/p2p/base/transportchannel.h
index 89c7e6d422086018981791e4019697e65801490f..ea18957ef369278a4c7f832b37873ec55765b82f 100644
--- a/webrtc/p2p/base/transportchannel.h
+++ b/webrtc/p2p/base/transportchannel.h
@@ -108,14 +108,13 @@
   virtual bool GetSslRole(rtc::SSLRole* role) const = 0;
 
   // Sets up the ciphers to use for DTLS-SRTP.
-  virtual bool SetSrtpCryptoSuites(const std::vector<int>& ciphers) = 0;
-  // Keep the original one for backward compatibility until all dependencies
-  // move away. TODO(guoweis): Remove this function.
-  virtual bool SetSrtpCiphers(const std::vector<std::string>& ciphers);
+  virtual bool SetSrtpCiphers(const std::vector<std::string>& ciphers) = 0;
 
   // Finds out which DTLS-SRTP cipher was negotiated.
   // TODO(guoweis): Remove this once all dependencies implement this.
-  virtual bool GetSrtpCryptoSuite(int* cipher) { return false; }
+  virtual bool GetSrtpCryptoSuite(std::string* cipher) {
+    return false;
+  }
 
   // Finds out which DTLS cipher was negotiated.
   // TODO(guoweis): Remove this once all dependencies implement this.