Enable RL sync by default on iOS

components/reading_list/ios/reading_list_entry.h

 // 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.
 
-#ifndef COMPONENTS_READING_LIST_READING_LIST_ENTRY_H_
-#define COMPONENTS_READING_LIST_READING_LIST_ENTRY_H_
+#ifndef COMPONENTS_READING_LIST_IOS_READING_LIST_ENTRY_H_
+#define COMPONENTS_READING_LIST_IOS_READING_LIST_ENTRY_H_
 
 #include <string>
 
 #include "base/files/file_path.h"
 #include "base/macros.h"
 #include "base/time/time.h"
 #include "net/base/backoff_entry.h"
 #include "url/gurl.h"
 
 namespace reading_list {
@@ skipping 113 matching lines @@
 
   // These value are in microseconds since Jan 1st 1970. They are used for
   // sorting the entries from the database. They are kept in int64_t to avoid
   // conversion on each save/read event.
   int64_t creation_time_us_;
   int64_t update_time_us_;
 
   DISALLOW_COPY_AND_ASSIGN(ReadingListEntry);
 };
 
-#endif  // COMPONENTS_READING_LIST_READING_LIST_ENTRY_H_
+#endif  // COMPONENTS_READING_LIST_IOS_READING_LIST_ENTRY_H_