Update iOS AppRTCDemo to use level controller.

webrtc/examples/objc/AppRTCDemo/mac/APPRTCViewController.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.
  */
 
@@ skipping 266 matching lines @@
 - (void)appClient:(ARDAppClient *)client
       didGetStats:(NSArray *)stats {
 }
 
 #pragma mark - APPRTCMainViewDelegate
 
 - (void)appRTCMainView:(APPRTCMainView*)mainView
         didEnterRoomId:(NSString*)roomId {
   [_client disconnect];
   ARDAppClient *client = [[ARDAppClient alloc] initWithDelegate:self];
-  [client connectToRoomWithId:roomId isLoopback:NO isAudioOnly:NO shouldMakeAecDump:NO];
+  [client connectToRoomWithId:roomId
+                   isLoopback:NO
+                  isAudioOnly:NO
+            shouldMakeAecDump:NO
+        shouldUseLevelControl:NO];
   _client = client;
 }
 
 #pragma mark - Private
 
 - (APPRTCMainView*)mainView {
   return (APPRTCMainView*)self.view;
 }
 
 - (void)showAlertWithMessage:(NSString*)message {
   NSAlert* alert = [[NSAlert alloc] init];
   [alert setMessageText:message];
   [alert runModal];
 }
 
 - (void)resetUI {
   [_remoteVideoTrack removeRenderer:self.mainView.remoteVideoView];
   _remoteVideoTrack = nil;
   [self.mainView.remoteVideoView renderFrame:nil];
 }
 
 - (void)disconnect {
   [self resetUI];
   [_client disconnect];
 }
 
 @end