Removes the IsReadingListEnabled flags

ios/chrome/browser/ui/side_swipe/side_swipe_controller.mm

 // Copyright 2015 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/browser/ui/side_swipe/side_swipe_controller.h"
 
 #include <memory>
 
 #import "base/ios/weak_nsobject.h"
 #include "components/reading_list/core/reading_list_model.h"
-#include "components/reading_list/core/reading_list_switches.h"
 #import "ios/chrome/browser/browser_state/chrome_browser_state.h"
 #import "ios/chrome/browser/infobars/infobar_container_view.h"
 #import "ios/chrome/browser/reading_list/reading_list_model_factory.h"
 #import "ios/chrome/browser/snapshots/snapshot_cache.h"
 #import "ios/chrome/browser/tabs/tab.h"
 #import "ios/chrome/browser/tabs/tab_model_observer.h"
 #import "ios/chrome/browser/ui/reading_list/reading_list_side_swipe_provider.h"
 #import "ios/chrome/browser/ui/side_swipe/card_side_swipe_view.h"
 #import "ios/chrome/browser/ui/side_swipe/history_side_swipe_provider.h"
 #import "ios/chrome/browser/ui/side_swipe/side_swipe_navigation_view.h"
@@ skipping 94 matching lines @@
 - (id)initWithTabModel:(TabModel*)model
           browserState:(ios::ChromeBrowserState*)browserState {
   DCHECK(model);
   self = [super init];
   if (self) {
     model_.reset(model);
     [model_ addObserver:self];
     historySideSwipeProvider_.reset(
         [[HistorySideSwipeProvider alloc] initWithTabModel:model_]);
 
-    if (reading_list::switches::IsReadingListEnabled()) {
-      readingListSideSwipeProvider_.reset([[ReadingListSideSwipeProvider alloc]
-          initWithReadingList:ReadingListModelFactory::GetForBrowserState(
-                                  browserState)]);
-    }
+    readingListSideSwipeProvider_.reset([[ReadingListSideSwipeProvider alloc]
+        initWithReadingList:ReadingListModelFactory::GetForBrowserState(
+                                browserState)]);
   }
   return self;
 }
 
 - (void)dealloc {
   [model_ removeObserver:self];
   [super dealloc];
 }
 
 - (void)addHorizontalGesturesToView:(UIView*)view {
@@ skipping 394 matching lines @@
     didChangeActiveTab:(Tab*)newTab
            previousTab:(Tab*)previousTab
                atIndex:(NSUInteger)index {
   // Toggling the gesture's enabled state off and on will effectively cancel
   // the gesture recognizer.
   [swipeGestureRecognizer_ setEnabled:NO];
   [swipeGestureRecognizer_ setEnabled:YES];
 }
 
 @end