Added DtlsCertificate, a ref counted object owning an SSLIdentity

talk/app/webrtc/objc/RTCPeerConnection.mm

 /*
  * libjingle
  * Copyright 2013 Google Inc.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
  *
  *  1. Redistributions of source code must retain the above copyright notice,
  *     this list of conditions and the following disclaimer.
  *  2. Redistributions in binary form must reproduce the above copyright notice,
@@ skipping 257 matching lines @@
       observer, mediaStreamTrack.mediaTrack, nativeOutputLevel);
 }
 
 @end
 
 @implementation RTCPeerConnection (Internal)
 
 - (instancetype)initWithFactory:(webrtc::PeerConnectionFactoryInterface*)factory
      iceServers:(const webrtc::PeerConnectionInterface::IceServers&)iceServers
     constraints:(const webrtc::MediaConstraintsInterface*)constraints {
-  NSParameterAssert(factory != NULL);
+  NSParameterAssert(factory != nullptr);
   if (self = [super init]) {
     _observer.reset(new webrtc::RTCPeerConnectionObserver(self));
     _peerConnection = factory->CreatePeerConnection(
-        iceServers, constraints, NULL, NULL, _observer.get());
+        iceServers,
+        constraints,
+        nullptr,
+        rtc::scoped_ptr<webrtc::DtlsIdentityStoreInterface>(nullptr).Pass(),
+        _observer.get());
     _localStreams = [[NSMutableArray alloc] init];
   }
   return self;
 }
 
 - (instancetype)initWithFactory:(webrtc::PeerConnectionFactoryInterface *)factory
                          config:(const webrtc::PeerConnectionInterface::RTCConfiguration &)config
                     constraints:(const webrtc::MediaConstraintsInterface *)constraints
                        delegate:(id<RTCPeerConnectionDelegate>)delegate {
   NSParameterAssert(factory);
   if (self = [super init]) {
     _observer.reset(new webrtc::RTCPeerConnectionObserver(self));
     _peerConnection =
-        factory->CreatePeerConnection(config, constraints, nullptr, nullptr, _observer.get());
+        factory->CreatePeerConnection(
+            config,
+            constraints,
+            nullptr,
+            rtc::scoped_ptr<webrtc::DtlsIdentityStoreInterface>(nullptr).Pass(),
+            _observer.get());
     _localStreams = [[NSMutableArray alloc] init];
     _delegate = delegate;
   }
   return self;
 }
 
 - (rtc::scoped_refptr<webrtc::PeerConnectionInterface>)peerConnection {
   return _peerConnection;
 }
 
 @end