Revert of 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 44d39cb0902deede6d7e7ff403289a7ae697e090..0d30acc0eb23ba6b00c8ea16eacfba8cf7d78fbc 100644
--- a/talk/app/webrtc/objc/RTCPeerConnection.mm
+++ b/talk/app/webrtc/objc/RTCPeerConnection.mm
@@ -208,9 +208,13 @@
   self.peerConnection->SetRemoteDescription(observer, sdp.sessionDescription);
 }
 
-- (BOOL)setConfiguration:(RTCConfiguration *)configuration {
-  return self.peerConnection->SetConfiguration(
-      configuration.nativeConfiguration);
+- (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);
 }
 
 - (RTCSessionDescription*)localDescription {