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

webrtc/examples/objc/AppRTCDemo/ARDAppClient.h

 /*
  *  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 <Foundation/Foundation.h>
-
-#import "RTCVideoTrack.h"
+#import "webrtc/api/objc/RTCPeerConnection.h"
+#import "webrtc/api/objc/RTCVideoTrack.h"
 
 typedef NS_ENUM(NSInteger, ARDAppClientState) {
   // Disconnected from servers.
   kARDAppClientStateDisconnected,
   // Connecting to servers.
   kARDAppClientStateConnecting,
   // Connected to servers.
   kARDAppClientStateConnected,
 };
 
 @class ARDAppClient;
 // The delegate is informed of pertinent events and will be called on the
 // main queue.
 @protocol ARDAppClientDelegate <NSObject>
 
 - (void)appClient:(ARDAppClient *)client
     didChangeState:(ARDAppClientState)state;
 
 - (void)appClient:(ARDAppClient *)client
-    didChangeConnectionState:(RTCICEConnectionState)state;
+    didChangeConnectionState:(RTCIceConnectionState)state;
 
 - (void)appClient:(ARDAppClient *)client
     didReceiveLocalVideoTrack:(RTCVideoTrack *)localVideoTrack;
 
 - (void)appClient:(ARDAppClient *)client
     didReceiveRemoteVideoTrack:(RTCVideoTrack *)remoteVideoTrack;
 
 - (void)appClient:(ARDAppClient *)client
          didError:(NSError *)error;
 
@@ skipping 20 matching lines @@
 // If |isLoopback| is true, the call will connect to itself.
 // If |isAudioOnly| is true, video will be disabled for the call.
 - (void)connectToRoomWithId:(NSString *)roomId
                  isLoopback:(BOOL)isLoopback
                 isAudioOnly:(BOOL)isAudioOnly;
 
 // Disconnects from the AppRTC servers and any connected clients.
 - (void)disconnect;
 
 @end