Ability to specify KeyType (RSA, ECDSA) in CreatePeerConnection

talk/app/webrtc/objc/RTCPeerConnection.mm

Index: talk/app/webrtc/objc/RTCPeerConnection.mm
diff --git a/talk/app/webrtc/objc/RTCPeerConnection.mm b/talk/app/webrtc/objc/RTCPeerConnection.mm
index 0d30acc0eb23ba6b00c8ea16eacfba8cf7d78fbc..729ea96cc7a92b1bbccf1579767f7e678213f10b 100644
--- a/talk/app/webrtc/objc/RTCPeerConnection.mm
+++ b/talk/app/webrtc/objc/RTCPeerConnection.mm
@@ -275,11 +275,12 @@ class RTCStatsObserver : public StatsObserver {
 - (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, nullptr, rtc::KT_DEFAULT,
+        _observer.get());
     _localStreams = [[NSMutableArray alloc] init];
   }
   return self;
@@ -293,7 +294,8 @@ class RTCStatsObserver : public StatsObserver {
   if (self = [super init]) {
     _observer.reset(new webrtc::RTCPeerConnectionObserver(self));
     _peerConnection =
-        factory->CreatePeerConnection(config, constraints, nullptr, nullptr, _observer.get());
+        factory->CreatePeerConnection(config, constraints, nullptr, nullptr,
+                                      rtc::KT_DEFAULT, _observer.get());
     _localStreams = [[NSMutableArray alloc] init];
     _delegate = delegate;
   }