Remove obsolete AbstractMigration class

src/Database/AbstractMigration.php

@@ -1,47 +0,0 @@
-<?php
-/*
- * This file is part of Flarum.
- *
- * (c) Toby Zerner <toby.zerner@gmail.com>
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-namespace Flarum\Database;
-
-use Flarum\Settings\SettingsRepositoryInterface;
-use Illuminate\Database\Schema\Builder;
-
-abstract class AbstractMigration
-{
-    /**
-     * @var Builder
-     */
-    protected $schema;
-
-    /**
-     * @var SettingsRepositoryInterface
-     */
-    protected $settings;
-
-    /**
-     * @param Builder $schema
-     * @param SettingsRepositoryInterface $settings
-     */
-    public function __construct(Builder $schema, SettingsRepositoryInterface $settings)
-    {
-        $this->schema = $schema;
-        $this->settings = $settings;
-    }
-
-    /**
-     * Run the migrations.
-     */
-    abstract public function up();
-
-    /**
-     * Reverse the migrations.
-     */
-    abstract public function down();
-}