Enable RL sync by default on iOS

ios/chrome/browser/share_extension/share_extension_item_receiver.mm

 // Copyright 2016 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/share_extension/share_extension_item_receiver.h"
 
 #import <UIKit/UIKit.h>
 
 #include "base/ios/block_types.h"
 #include "base/mac/bind_objc_block.h"
 #include "base/mac/foundation_util.h"
 #include "base/mac/scoped_nsobject.h"
 #include "base/metrics/histogram.h"
 #include "base/metrics/user_metrics_action.h"
 #include "base/strings/sys_string_conversions.h"
 #include "base/strings/utf_string_conversions.h"
 #include "components/bookmarks/browser/bookmark_model.h"
-#include "components/reading_list/reading_list_model.h"
-#include "components/reading_list/reading_list_model_observer.h"
+#include "components/reading_list/ios/reading_list_model.h"
+#include "components/reading_list/ios/reading_list_model_observer.h"
 #include "ios/chrome/browser/experimental_flags.h"
 #include "ios/chrome/common/app_group/app_group_constants.h"
 #include "ios/web/public/web_thread.h"
 #import "net/base/mac/url_conversions.h"
 #include "url/gurl.h"
 
 #if !defined(__has_feature) || !__has_feature(objc_arc)
 #error "This file requires ARC support."
 #endif
 
@@ skipping 315 matching lines @@
 
 - (NSOperationQueue*)presentedItemOperationQueue {
   return [NSOperationQueue mainQueue];
 }
 
 - (NSURL*)presentedItemURL {
   return app_group::ShareExtensionItemsFolder();
 }
 
 @end