Added DtlsCertificate, a ref counted object owning an SSLIdentity

talk/app/webrtc/java/jni/peerconnection_jni.cc

Index: talk/app/webrtc/java/jni/peerconnection_jni.cc
diff --git a/talk/app/webrtc/java/jni/peerconnection_jni.cc b/talk/app/webrtc/java/jni/peerconnection_jni.cc
index bf0f0066294c5c9d77a5ebabc0ef2bf5d16a788b..4647d140c0d2a109923f08965e43ad573ee839d4 100644
--- a/talk/app/webrtc/java/jni/peerconnection_jni.cc
+++ b/talk/app/webrtc/java/jni/peerconnection_jni.cc
@@ -1374,7 +1374,11 @@ JOW(jlong, PeerConnectionFactory_nativeCreatePeerConnection)(
   PCOJava* observer = reinterpret_cast<PCOJava*>(observer_p);
   observer->SetConstraints(new ConstraintsWrapper(jni, j_constraints));
   rtc::scoped_refptr<PeerConnectionInterface> pc(f->CreatePeerConnection(
-      rtc_config, observer->constraints(), NULL, NULL, observer));
+      rtc_config,
+      observer->constraints(),
+      nullptr,
+      rtc::scoped_ptr<webrtc::DtlsIdentityStoreInterface>(nullptr).Pass(),
+      observer));
   return (jlong)pc.release();
 }