Convert internal representation of Srtp cryptos from string to int.

webrtc/p2p/base/transportchannel.cc

Index: webrtc/p2p/base/transportchannel.cc
diff --git a/webrtc/p2p/base/transportchannel.cc b/webrtc/p2p/base/transportchannel.cc
index 63d84494e5485eb55b542def562c39c9a7df1398..9662f0ae6c7cbe5fb0ef1312be9fe5314de9e20f 100644
--- a/webrtc/p2p/base/transportchannel.cc
+++ b/webrtc/p2p/base/transportchannel.cc
@@ -54,4 +54,13 @@ void TransportChannel::set_dtls_state(DtlsTransportState state) {
   SignalDtlsState(this);
 }
 
+// TODO(guoweis): Remove this function once everything is moved away.
+bool TransportChannel::SetSrtpCiphers(const std::vector<std::string>& ciphers) {
+  std::vector<int> crypto_suites;
+  for (const auto cipher : ciphers) {
+    crypto_suites.push_back(rtc::SrtpCryptoSuiteFromName(cipher));
+  }
+  return SetSrtpCryptoSuites(crypto_suites);
+}
+
 }  // namespace cricket