Enable RL sync by default on iOS

components/reading_list/reading_list_switches.cc

-// 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 "components/reading_list/reading_list_switches.h"
-
-#include "base/command_line.h"
-
-namespace reading_list {
-namespace switches {
-// Enables the reading list.
-const char kEnableReadingList[] = "enable-reading-list";
-
-// Disables the reading list.
-const char kDisableReadingList[] = "disable-reading-list";
-
-bool IsReadingListEnabled() {
-  if (base::CommandLine::ForCurrentProcess()->HasSwitch(kEnableReadingList)) {
-    return true;
-  }
-  return false;
-}
-}  // namespace switches
-}  // namespace reading_list