[ObjC ARC] Converts ios/chrome/browser/ui:ui to ARC.

ios/chrome/browser/ui/orientation_limiting_navigation_controller.mm

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #import "ios/chrome/browser/ui/orientation_limiting_navigation_controller.h"
 
 #include "base/logging.h"
 #include "ios/chrome/browser/ui/ui_util.h"
 
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
 @implementation OrientationLimitingNavigationController
 
 - (NSUInteger)supportedInterfaceOrientations {
   return IsIPadIdiom() ? [super supportedInterfaceOrientations]
                        : UIInterfaceOrientationMaskPortrait;
 }
 
 - (UIInterfaceOrientation)preferredInterfaceOrientationForPresentation {
   return IsIPadIdiom() ? [super preferredInterfaceOrientationForPresentation]
                        : UIInterfaceOrientationPortrait;
 }
 
 - (BOOL)shouldAutorotate {
   return IsIPadIdiom() ? [super shouldAutorotate] : NO;
 }
 
 @end