Adding PeerConnectionInterface::SetConfiguration method.

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..44d39cb0902deede6d7e7ff403289a7ae697e090 100644
--- a/talk/app/webrtc/objc/RTCPeerConnection.mm
+++ b/talk/app/webrtc/objc/RTCPeerConnection.mm
@@ -208,13 +208,9 @@ class RTCStatsObserver : public StatsObserver {
   self.peerConnection->SetRemoteDescription(observer, sdp.sessionDescription);
 }
 
-- (BOOL)updateICEServers:(NSArray*)servers
-             constraints:(RTCMediaConstraints*)constraints {
-  webrtc::PeerConnectionInterface::IceServers iceServers;
-  for (RTCICEServer* server in servers) {
-    iceServers.push_back(server.iceServer);
-  }
-  return self.peerConnection->UpdateIce(iceServers, constraints.constraints);
+- (BOOL)setConfiguration:(RTCConfiguration *)configuration {
+  return self.peerConnection->SetConfiguration(
+      configuration.nativeConfiguration);
 }
 
 - (RTCSessionDescription*)localDescription {