Negotiate the same SRTP crypto suites for every DTLS association formed.

webrtc/pc/peerconnectioninterface_unittest.cc

Index: webrtc/pc/peerconnectioninterface_unittest.cc
diff --git a/webrtc/pc/peerconnectioninterface_unittest.cc b/webrtc/pc/peerconnectioninterface_unittest.cc
index e7636e024fe624eb7838e42c8664b9c653b2f2a4..49c5e15f5d24fdc4f875d60d74c7ea33d6417604 100644
--- a/webrtc/pc/peerconnectioninterface_unittest.cc
+++ b/webrtc/pc/peerconnectioninterface_unittest.cc
@@ -662,7 +662,7 @@ class PeerConnectionFactoryForTest : public webrtc::PeerConnectionFactory {
       bool redetermine_role_on_ice_restart) override {
     transport_controller = new cricket::TransportController(
         rtc::Thread::Current(), rtc::Thread::Current(), port_allocator,
-        redetermine_role_on_ice_restart);
+        redetermine_role_on_ice_restart, rtc::CryptoOptions());
     return transport_controller;
   }