Disable folder UI when app sync is disabled

ui/app_list/views/apps_grid_view.cc

 // Copyright (c) 2012 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 "ui/app_list/views/apps_grid_view.h"
 
 #include <algorithm>
 #include <set>
 #include <string>
 
@@ skipping 1975 matching lines @@
 }
 
 void AppsGridView::OnImplicitAnimationsCompleted() {
   if (layer()->opacity() == 0.0f)
     SetVisible(false);
 }
 
 bool AppsGridView::EnableFolderDragDropUI() {
   // Enable drag and drop folder UI only if it is at the app list root level
   // and the switch is on and the target folder can still accept new items.
-  return switches::IsFolderUIEnabled() && !folder_delegate_ &&
-         CanDropIntoTarget(drop_target_);
+  return model_->folders_enabled() && !folder_delegate_ &&
+      CanDropIntoTarget(drop_target_);
 }
 
 bool AppsGridView::CanDropIntoTarget(const Index& drop_target) {
   views::View* target_view = GetViewAtSlotOnCurrentPage(drop_target.slot);
   if (!target_view)
     return true;
 
   AppListItem* target_item =
       static_cast<AppListItemView*>(target_view)->item();
   // Items can be dropped into non-folders (which have no children) or folders
@@ skipping 162 matching lines @@
 void AppsGridView::SetAsFolderDroppingTarget(const Index& target_index,
                                              bool is_target_folder) {
   AppListItemView* target_view =
       static_cast<AppListItemView*>(
           GetViewAtSlotOnCurrentPage(target_index.slot));
   if (target_view)
     target_view->SetAsAttemptedFolderTarget(is_target_folder);
 }
 
 }  // namespace app_list