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

webrtc/examples/objc/AppRTCDemo/ARDCEODTURNClient.m

Index: webrtc/examples/objc/AppRTCDemo/ARDCEODTURNClient.m
diff --git a/webrtc/examples/objc/AppRTCDemo/ARDCEODTURNClient.m b/webrtc/examples/objc/AppRTCDemo/ARDCEODTURNClient.m
index 70f815a6a8bf9457961eab19fe34a55e830aaebd..af79b4a1b40d542ed8a6eb7f904f7f7ebd99ac7e 100644
--- a/webrtc/examples/objc/AppRTCDemo/ARDCEODTURNClient.m
+++ b/webrtc/examples/objc/AppRTCDemo/ARDCEODTURNClient.m
@@ -11,7 +11,7 @@
 #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";
@@ -30,8 +30,8 @@ static NSInteger kARDCEODTURNClientErrorBadResponse = -1;
   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
@@ -42,24 +42,23 @@ static NSInteger kARDCEODTURNClientErrorBadResponse = -1;
                   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);
   }];
 }