Tweaks for new Objective-C API.

BUG=

Review URL: https://codereview.webrtc.org/1696673003

Cr-Commit-Position: refs/heads/master@{#11872}
diff --git a/webrtc/api/objc/RTCIceServer.mm b/webrtc/api/objc/RTCIceServer.mm
index bdac700..9fc2154 100644
--- a/webrtc/api/objc/RTCIceServer.mm
+++ b/webrtc/api/objc/RTCIceServer.mm
@@ -50,7 +50,7 @@
 
 #pragma mark - Private
 
-- (webrtc::PeerConnectionInterface::IceServer)iceServer {
+- (webrtc::PeerConnectionInterface::IceServer)nativeServer {
   __block webrtc::PeerConnectionInterface::IceServer iceServer;
 
   iceServer.username = [NSString stdStringForString:_username];