Added DtlsCertificate, a ref counted object owning an SSLIdentity

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 926de95a3bffed498bb8291ed4bd80a99cb048e3..74193edf9822cce4ff5175be14e1546670847036 100644
--- a/webrtc/p2p/base/p2ptransportchannel.h
+++ b/webrtc/p2p/base/p2ptransportchannel.h
@@ -122,7 +122,8 @@ class P2PTransportChannel : public TransportChannelImpl,
   }
 
   // Returns false because the channel is not encrypted by default.
-  virtual bool GetLocalIdentity(rtc::SSLIdentity** identity) const {
+  bool GetLocalCertificate(
+      rtc::scoped_refptr<webrtc::DtlsCertificate>* certificate) const override {
     return false;
   }
 
@@ -141,7 +142,8 @@ class P2PTransportChannel : public TransportChannelImpl,
     return false;
   }
 
-  virtual bool SetLocalIdentity(rtc::SSLIdentity* identity) {
+  virtual bool SetLocalCertificate(
+      rtc::scoped_refptr<webrtc::DtlsCertificate> certificate) {
     return false;
   }