Removes the IsReadingListEnabled flags

ios/chrome/browser/ui/tools_menu/tools_menu_model.mm

 // Copyright 2017 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/ui/tools_menu/tools_menu_model.h"
 
-#include "components/reading_list/core/reading_list_switches.h"
 #include "components/strings/grit/components_strings.h"
 #include "ios/chrome/browser/experimental_flags.h"
 #include "ios/chrome/browser/ui/commands/ios_command_ids.h"
 #import "ios/chrome/browser/ui/tools_menu/reading_list_menu_view_item.h"
 #include "ios/chrome/browser/ui/tools_menu/tools_menu_constants.h"
 #include "ios/chrome/browser/ui/ui_util.h"
 #include "ios/chrome/grit/ios_strings.h"
 #include "ios/public/provider/chrome/browser/chrome_browser_provider.h"
 #import "ios/public/provider/chrome/browser/user_feedback/user_feedback_provider.h"
 #include "ios/web/public/user_agent.h"
@@ skipping 69 matching lines @@
     return false;
 
   if (!configuration.inIncognito && (item.visibility & kVisibleIncognitoOnly))
     return false;
 
   switch (item.title_id) {
     case IDS_IOS_TOOLBAR_SHOW_TABS:
       return IsIPadIdiom();
     case IDS_IOS_TOOLS_MENU_READER_MODE:
       return experimental_flags::IsReaderModeEnabled();
-    case IDS_IOS_TOOLS_MENU_READING_LIST:
-      return reading_list::switches::IsReadingListEnabled();
     case IDS_IOS_TOOLS_MENU_SUGGESTIONS:
       return experimental_flags::IsSuggestionsUIEnabled();
     case IDS_IOS_OPTIONS_REPORT_AN_ISSUE:
       return ios::GetChromeBrowserProvider()
           ->GetUserFeedbackProvider()
           ->IsUserFeedbackEnabled();
     // TODO(crbug.com/696676): Talk to UI/UX people to decide the correct
     // behavior of "Requestion Desktop/Mobile Site" (e.g. Whether user agent
     // flag should stick when going backward and which cell should be visible
     // when navigating to native pages).
     case IDS_IOS_TOOLS_MENU_REQUEST_DESKTOP_SITE:
 #ifdef HIDE_REQUEST_MOBILE_SITE_CELL
       return true;
 #else
       return (configuration.userAgentType != web::UserAgentType::DESKTOP);
 #endif
     case IDS_IOS_TOOLS_MENU_REQUEST_MOBILE_SITE:
 // TODO(crbug.com/678047) Remove this switch when request mobile site
 // functionality is implemented.
 #ifdef HIDE_REQUEST_MOBILE_SITE_CELL
       return false;
 #else
       return (configuration.userAgentType == web::UserAgentType::DESKTOP);
 #endif
     default:
       return true;
   }
 }