Removes the IsReadingListEnabled flags

ios/chrome/app/startup_tasks.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/app/startup_tasks.h"
 
 #import <MediaPlayer/MediaPlayer.h>
 
 #import "base/ios/weak_nsobject.h"
 #import "base/mac/bind_objc_block.h"
 #include "components/bookmarks/browser/startup_task_runner_service.h"
-#include "components/reading_list/core/reading_list_switches.h"
 #import "ios/chrome/app/deferred_initialization_runner.h"
 #include "ios/chrome/app/tests_hook.h"
 #include "ios/chrome/browser/application_context.h"
 #include "ios/chrome/browser/bookmarks/startup_task_runner_service_factory.h"
 #include "ios/chrome/browser/browser_state/chrome_browser_state.h"
 #include "ios/chrome/browser/ios_chrome_io_thread.h"
 #import "ios/chrome/browser/omaha/omaha_service.h"
 #include "ios/chrome/browser/reading_list/reading_list_download_service.h"
 #include "ios/chrome/browser/reading_list/reading_list_download_service_factory.h"
 #import "ios/chrome/browser/ui/main/browser_view_information.h"
@@ skipping 54 matching lines @@
              name:UIApplicationWillResignActiveNotification
            object:nil];
 }
 
 #pragma mark - Private methods.
 
 - (void)performDeferredInitializationForBrowserState:
     (ios::ChromeBrowserState*)browserState {
   ios::StartupTaskRunnerServiceFactory::GetForBrowserState(browserState)
       ->StartDeferredTaskRunners();
-  if (reading_list::switches::IsReadingListEnabled()) {
-    ReadingListDownloadServiceFactory::GetForBrowserState(browserState)
-        ->Initialize();
-  }
+  ReadingListDownloadServiceFactory::GetForBrowserState(browserState)
+      ->Initialize();
 }
 
 - (void)applicationWillResignActiveNotification:(NSNotification*)notification {
   // If the control center is displaying now-playing information from Chrome,
   // attempt to clear it so that the URL is no longer shown
   // (crbug.com/475820). The now-playing information will not be cleared if
   // it's from a different app.
   NSDictionary* nowPlayingInfo =
       [[MPNowPlayingInfoCenter defaultCenter] nowPlayingInfo];
   if (nowPlayingInfo[MPMediaItemPropertyTitle]) {
     // No need to clear playing info if media is being played but there is no
     // way to check if video or audio is playing in web view.
     [[MPNowPlayingInfoCenter defaultCenter] setNowPlayingInfo:nil];
   }
 }
 
 @end