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/objctests/RTCIceServerTest.mm b/webrtc/api/objctests/RTCIceServerTest.mm
index 2e6fb25..5116ba0 100644
--- a/webrtc/api/objctests/RTCIceServerTest.mm
+++ b/webrtc/api/objctests/RTCIceServerTest.mm
@@ -31,7 +31,7 @@
   RTCIceServer *server = [[RTCIceServer alloc] initWithURLStrings:@[
       @"stun:stun1.example.net" ]];
 
-  webrtc::PeerConnectionInterface::IceServer iceStruct = server.iceServer;
+  webrtc::PeerConnectionInterface::IceServer iceStruct = server.nativeServer;
   EXPECT_EQ(1u, iceStruct.urls.size());
   EXPECT_EQ("stun:stun1.example.net", iceStruct.urls.front());
   EXPECT_EQ("", iceStruct.username);
@@ -42,7 +42,7 @@
   RTCIceServer *server = [[RTCIceServer alloc] initWithURLStrings:@[
       @"turn1:turn1.example.net", @"turn2:turn2.example.net" ]];
 
-  webrtc::PeerConnectionInterface::IceServer iceStruct = server.iceServer;
+  webrtc::PeerConnectionInterface::IceServer iceStruct = server.nativeServer;
   EXPECT_EQ(2u, iceStruct.urls.size());
   EXPECT_EQ("turn1:turn1.example.net", iceStruct.urls.front());
   EXPECT_EQ("turn2:turn2.example.net", iceStruct.urls.back());
@@ -55,7 +55,7 @@
       initWithURLStrings:@[ @"turn1:turn1.example.net" ]
                 username:@"username"
               credential:@"credential"];
-  webrtc::PeerConnectionInterface::IceServer iceStruct = server.iceServer;
+  webrtc::PeerConnectionInterface::IceServer iceStruct = server.nativeServer;
   EXPECT_EQ(1u, iceStruct.urls.size());
   EXPECT_EQ("turn1:turn1.example.net", iceStruct.urls.front());
   EXPECT_EQ("username", iceStruct.username);