Remove more dead app list code.

ui/app_list/app_list_model.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/app_list_model.h"
 
 #include <string>
 #include <utility>
 
 #include "ui/app_list/app_list_folder_item.h"
@@ skipping 274 matching lines @@
 
   // crbug.com/368111: Upon uninstall of 2nd-to-last folder item, reparent last
   // item to top; this will remove the folder.
   AppListFolderItem* folder = FindFolderItem(folder_id);
   if (folder && folder->ChildItemCount() == 1u) {
     AppListItem* last_item = folder->item_list()->item_at(0);
     MoveItemToFolderAt(last_item, "", folder->position());
   }
 }
 
-void AppListModel::NotifyExtensionPreferenceChanged() {
-  for (size_t i = 0; i < top_level_item_list_->item_count(); ++i)
-    top_level_item_list_->item_at(i)->OnExtensionPreferenceChanged();
-}
-
 void AppListModel::SetFoldersEnabled(bool folders_enabled) {
   folders_enabled_ = folders_enabled;
   if (folders_enabled)
     return;
   // Remove child items from folders.
   std::vector<std::string> folder_ids;
   for (size_t i = 0; i < top_level_item_list_->item_count(); ++i) {
     AppListItem* item = top_level_item_list_->item_at(i);
     if (item->GetItemType() != AppListFolderItem::kItemType)
       continue;
@@ skipping 135 matching lines @@
       folder->item_list()->RemoveItem(item->id());
   result->set_folder_id("");
   if (folder->item_list()->item_count() == 0) {
     DVLOG(2) << "Deleting empty folder: " << folder->ToDebugString();
     DeleteItem(folder_id);
   }
   return result;
 }
 
 }  // namespace app_list