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

webrtc/examples/objc/AppRTCDemo/ARDAppEngineClient.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 "ARDAppEngineClient.h"
 
-#import "RTCLogging.h"
+#import "webrtc/base/objc/RTCLogging.h"
 
 #import "ARDJoinResponse.h"
 #import "ARDMessageResponse.h"
 #import "ARDSignalingMessage.h"
 #import "ARDUtilities.h"
 
 // TODO(tkchin): move these to a configuration object.
 static NSString * const kARDRoomServerHostUrl =
     @"https://apprtc.appspot.com";
 static NSString * const kARDRoomServerJoinFormat =
@@ skipping 142 matching lines @@
   NSError *error =
       [[NSError alloc] initWithDomain:kARDAppEngineClientErrorDomain
                                  code:kARDAppEngineClientErrorBadResponse
                              userInfo:@{
     NSLocalizedDescriptionKey: @"Error parsing response.",
   }];
   return error;
 }
 
 @end