Enable RL sync by default on iOS

ios/chrome/browser/reading_list/url_downloader_unittest.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.
 
 #include "ios/chrome/browser/reading_list/url_downloader.h"
 
 #include <vector>
 
 #include "base/files/file_util.h"
 #import "base/mac/bind_objc_block.h"
 #include "base/path_service.h"
 #include "base/run_loop.h"
 #import "base/test/ios/wait_util.h"
-#include "components/reading_list/offline_url_utils.h"
+#include "components/reading_list/ios/offline_url_utils.h"
 #include "ios/chrome/browser/chrome_paths.h"
 #include "ios/chrome/browser/dom_distiller/distiller_viewer.h"
 #include "ios/chrome/browser/reading_list/offline_url_utils.h"
 #include "ios/web/public/test/test_web_thread_bundle.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace {
 
 class DistillerViewerTest : public dom_distiller::DistillerViewerInterface {
  public:
@@ skipping 158 matching lines @@
   ASSERT_TRUE(std::find(downloader_->downloaded_files_.begin(),
                         downloader_->downloaded_files_.end(),
                         url) != downloader_->downloaded_files_.end());
   ASSERT_TRUE(std::find(downloader_->removed_files_.begin(),
                         downloader_->removed_files_.end(),
                         url) != downloader_->removed_files_.end());
   ASSERT_TRUE(downloader_->CheckExistenceOfOfflineURLPagePath(url));
 }
 
 }  // namespace