Added DtlsCertificate, a ref counted object owning an SSLIdentity

webrtc/p2p/base/transportchannelproxy.cc

Index: webrtc/p2p/base/transportchannelproxy.cc
diff --git a/webrtc/p2p/base/transportchannelproxy.cc b/webrtc/p2p/base/transportchannelproxy.cc
index 79772514c69a3adc3b53172a688732d1c6ef5e5e..f27b7cb6f5e3af60ad4a46225ec967e8208e09e7 100644
--- a/webrtc/p2p/base/transportchannelproxy.cc
+++ b/webrtc/p2p/base/transportchannelproxy.cc
@@ -189,13 +189,13 @@ bool TransportChannelProxy::GetSslCipher(std::string* cipher) {
   return impl_->GetSslCipher(cipher);
 }
 
-bool TransportChannelProxy::GetLocalIdentity(
-    rtc::SSLIdentity** identity) const {
+bool TransportChannelProxy::GetLocalCertificate(
+    rtc::scoped_refptr<webrtc::DtlsCertificate>* certificate) const {
   ASSERT(rtc::Thread::Current() == worker_thread_);
   if (!impl_) {
     return false;
   }
-  return impl_->GetLocalIdentity(identity);
+  return impl_->GetLocalCertificate(certificate);
 }
 
 bool TransportChannelProxy::GetRemoteCertificate(