Update iOS AppRTCDemo to use the updated Objective-C API.

webrtc/examples/objc/AppRTCDemo/ARDCEODTURNClient.m

 /*
  *  Copyright 2014 The WebRTC Project Authors. All rights reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
 #import "ARDCEODTURNClient.h"
 
 #import "ARDUtilities.h"
-#import "RTCICEServer+JSON.h"
+#import "RTCIceServer+JSON.h"
 
 // TODO(tkchin): move this to a configuration object.
 static NSString *kTURNOriginURLString = @"https://apprtc.appspot.com";
 static NSString *kARDCEODTURNClientErrorDomain = @"ARDCEODTURNClient";
 static NSInteger kARDCEODTURNClientErrorBadResponse = -1;
 
 @implementation ARDCEODTURNClient {
   NSURL *_url;
 }
 
 - (instancetype)initWithURL:(NSURL *)url {
   NSParameterAssert([url absoluteString].length);
   if (self = [super init]) {
     _url = url;
   }
   return self;
 }
 
-- (void)requestServersWithCompletionHandler:
-    (void (^)(NSArray *turnServers,
+- (void)requestServerWithCompletionHandler:
+    (void (^)(RTCIceServer *turnServer,
               NSError *error))completionHandler {
   NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:_url];
   // We need to set origin because TURN provider whitelists requests based on
   // origin.
   [request addValue:@"Mozilla/5.0" forHTTPHeaderField:@"user-agent"];
   [request addValue:kTURNOriginURLString forHTTPHeaderField:@"origin"];
   [NSURLConnection sendAsyncRequest:request
                   completionHandler:^(NSURLResponse *response,
                                       NSData *data,
                                       NSError *error) {
-    NSArray *turnServers = [NSArray array];
     if (error) {
-      completionHandler(turnServers, error);
+      completionHandler(nil, error);
       return;
     }
     NSDictionary *dict = [NSDictionary dictionaryWithJSONData:data];
-    turnServers = [RTCICEServer serversFromCEODJSONDictionary:dict];
-    if (!turnServers) {
+    RTCIceServer *turnServer = [RTCIceServer serverFromCEODJSONDictionary:dict];
+    if (!turnServer) {
       NSError *responseError =
           [[NSError alloc] initWithDomain:kARDCEODTURNClientErrorDomain
                                      code:kARDCEODTURNClientErrorBadResponse
                                  userInfo:@{
             NSLocalizedDescriptionKey: @"Bad TURN response.",
           }];
-      completionHandler(turnServers, responseError);
+      completionHandler(turnServer, responseError);
       return;
     }
-    completionHandler(turnServers, nil);
+    completionHandler(turnServer, nil);
   }];
 }
 
 @end